JPH05334Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rigid injection molding machine. In particular, it relates to a rigid injection molding machine in which an in-line screw type injection device is arranged below a mold clamping device.

[Conventional technology]

Conventionally, a rigid injection molding machine in which a pair of molds is clamped by a mold clamping device in the vertical direction is one in which the injection device is installed in the rigid direction in the same direction as the mold clamping direction;
Alternatively, it is known that the injection device is provided in the horizontal direction orthogonal to the mold clamping direction.

[Problem that the invention attempts to solve]

The former has the disadvantage that the overall height of the machine is high relative to its capacity because the injection device is located in the rigid direction, which is the same direction as the mold clamping direction. In particular, when the injection device is located below the mold clamping device, the height of the working surface becomes high, resulting in a disadvantage that workability is reduced.

The latter can reduce the overall height of the machine, but since the injection is from the parting line of the mold, it is not possible to use a general mold, that is, a mold with a material flow path perpendicular to the parting line. There is a drawback that it cannot be used.

An object of the present invention is to provide a rigid injection molding machine which is capable of reducing the overall height of the machine and improving workability, while assuming the use of general molds.

[Means for solving problems]

Therefore, in the present invention, in a rigid injection molding machine in which the mold clamping direction of a pair of molds by a mold clamping device is the vertical direction, a screw cylinder is arranged below the mold clamping device in the vertical direction; A screw is housed in a cylinder so as to be rotatable and move forward and backward in the vertical direction, and the plasticized material is injected into a cavity formed in the pair of molds through the screw, which is arranged on the axis of the screw. The present invention is characterized in that an in-line screw type injection device is provided, which includes an injection cylinder that rotates the screw, and a drive source that is arranged in a direction perpendicular to the axis of the screw and rotates the screw via a deceleration mechanism.

[Effect]

Therefore, since the drive source is provided in a direction perpendicular to the axis of the screw, the height of the injection device can be reduced. This makes it possible to reduce the overall height of the rigid injection molding machine, and also to lower the height of the work surface, thereby improving work efficiency. Of course, since the injection direction is vertical, general molds can also be used.

Furthermore, if the in-line screw type injection device is mounted on a movable trolley, the injection device can be moved from below the mold clamping device, and therefore inspection work of the nozzles of the injection device can be easily performed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figure 1 shows the cross section of the rigid injection molding machine of this example.
Figure 2 shows the front view. In these figures, a frame 11 formed in a substantially box shape
A mold clamping device 21 is installed on the upper part of the frame 11, and an in-line screw type injection device 41 is installed inside the frame 11 via a trolley 31.
It is provided so that it can be pulled out to the front (to the left in FIG. 1).

The mold clamping device 21 clamps the ceiling wall 1 of the frame 11.
1A and has a lower die 29 on its upper surface; a base member 23 located above the fixed platen 22; and several tie bars 24 connecting the base member 23 and the fixed platen 22. and a movable platen 26 having a mold clamping cylinder 25 attached to the base member 23, and an upper mold 30 connected to the ram 25A of the mold clamping cylinder 25 and slidably fitted to the tie bar 24.
and an intermediate frame body 28 which is interposed between the fixed platen 22 and the base member 23 and receives a tightening force from a nut 27 screwed into the tie bar 24. Therefore, the upper mold 30 is moved up and down relative to the lower mold 29 by driving the mold clamping cylinder 25 . That is, the clamping direction of the upper mold 30 and the lower mold 29 is the vertical direction.

The trolley 31 is provided so as to be able to run on rails 32 laid so that a portion thereof enters into the frame 11 . On the rail 32, the cart 3
A stopper 33 is provided for holding the injection device 41 disposed on the carriage 31 at a predetermined position relative to the lower mold 29.

The injection device 41 has a screw 54 inside which will be described later.
an injection section 42 that stores the material vertically upward, plasticizes and measures the supplied material, and injects the material into the cage between the upper mold 30 and the lower mold 29;
2, and a drive section 44 that provides power to this material supply section 43 and the injection section 42. Drive section 44
is supported on the upper surface of the truck 31 via a shaft 45 so as to be swingable in the vertical direction, that is, the injection section 42 is supported to be swingable in the vertical direction with the shaft 45 as a fulcrum. Further, the injection section 42 is suspended from the fixed platen 22 by a pair of clamp cylinders 46A and 46B provided on both sides thereof. Each of the clamping cylinders 46A, 46B has its upper end rotatably connected to the fixed platen 22, and its lower end rotatably connected to a bracket 47 provided on the injection section 42. Therefore, the injection device 4 with the shaft 45 as a fulcrum
The downward weight of 1 is a pair of clamp cylinders 4
The injection device 41 is supported by the clamp cylinders 46A and 46B, and can swing vertically about the shaft 45 as a fulcrum by the expansion and contraction of the clamp cylinders 46A and 46B.

Now, the specific structure of the injection section 42, material supply section 43, and drive section 44 that constitute the injection device 41 is shown in FIG.

First, the injection part 42 includes a cylinder holding cylinder 51 having a vertical hole 51A therein, a screw cylinder 53 vertically inserted into the hole 51A of the cylinder holding cylinder 51 via a key 52, and A screw 54 is rotatably housed in a screw cylinder 53 and is movable up and down.
4, and an injection cylinder 57 that injects plasticized material through a screw 54.

Cylinder holding cylinder 51 and gear case 55 are connected by bolts 61. A nozzle 62 is screwed into the upper end of the screw cylinder 53 and is pressed against the lower mold 29 through 12 through holes formed through the center of the fixed platen 22, and a nozzle 62 is screwed onto the upper end of the screw cylinder 53. Heater 63 on the surface
is provided. A spline shaft 64 that is coaxial with the axis of the screw 54 and passes through the gear case 55 is integrally connected to the lower end of the screw 54 . A lifting plate 66 that is connected to the plunger 65 of the injection cylinder 57 and slides along the guide bar 56 is in contact with the lower end of the spline shaft 64 . A position scale 67 is attached to the elevating plate 66 in parallel with the guide bar 56, and the screw 54 is mounted opposite to the position scale 67 from the position scale 67.
A detector (not shown) is provided to detect the amount of descent of the screw cylinder 53, that is, the amount of material accumulated in the screw cylinder 53.

Further, the material supply section 43 includes a feeder tube 71 disposed on one side of the upper part of the screw cylinder 53 at a right angle to the screw 54, and a feeder tube 71 which is rotatable inside the feeder tube 71 and which includes the screw 54.
4, and a hopper 73 for supplying material to the material inlet side of the feeder screw 72. On the material outlet side of the feeder cylinder 71, there is a material supply path 75 that communicates with a material introduction path 74 formed at an angle in the cylinder holding cylinder 51 and the screw cylinder 53.
is formed. Therefore, the material stored in the hopper 73 is fed by the rotation of the feeder screw 72 and is fed into the screw cylinder 53 from the material supply path 75 through the material introduction path 74.

Further, the drive section 44 is configured to include the gear case 55.
A connecting tube 81 connected to one side and supported by the truck 31 via the shaft 45 so as to be able to swing vertically; and a hydraulic motor 82 as a drive source fixed to one side of the connecting tube 81. And this hydraulic motor 82
a bevel gear box 85 that transmits the rotation of a drive shaft 83 to a shaft 84 orthogonal to the drive shaft 83;
The rotation of the shaft 84 is decelerated to reduce the rotation of the spline shaft 6.
4, and a motor 87 fixed to the connecting cylinder 81 and transmitting rotation to the feeder screw 72. Therefore, the hydraulic motor 8 that rotates the screw 54
2 is arranged in a direction perpendicular to the axis of the screw 54.

The feeder tube 71 is attached to the connection tube 81 via several bolts. The speed reduction mechanism 86 includes a first gear 88 attached to the shaft 84, a second gear 89 meshed with the first gear 88 and rotatably supported within the gear case 55, and a second gear 89 that is meshed with the first gear 88 and rotatably supported within the gear case 55. and a third gear 90 that is rotatably provided coaxially with the spline shaft 64 within the gear case 55 and meshed with the gear 89 . A spline hole 9 is located at the center of the third gear 90 and is slidably engaged with the spline shaft 64 only in the axial direction.
1 is formed. Therefore, since the spline shaft 64 can be pulled upward relative to the third gear 90, the screw 54 can be removed by removing the bolt 61.
Screw cylinder 53 and cylinder holding cylinder 5
It can be removed together with 1.

Next, the operation of this embodiment will be explained.

First, upon starting, after the upper mold 30 and lower mold 29 are clamped by the mold clamping device 21, the nozzle 6 is
2 is brought into pressure contact with the lower mold 29 through the through hole 12 of the fixed platen 22.

In this state, when the hydraulic motor 82 is driven, the screw 54 is rotated via the drive shaft 83, bevel gearbox 85, and reduction mechanism 86. On the other hand, the material stored in the hopper 73 is sent to the left in FIG. sent inward. Then, as the screw 54 inside the screw cylinder 53 rotates, the screw 54 is plasticized and melted and sent above the screw cylinder 53, so that the screw 54 receives a downward thrust force and is lowered. At this time, back pressure is applied to the injection cylinder 57.

When the position scale 67 and a detector (not shown) detect that the amount of descent of the screw 54 has reached a predetermined amount, that is, the material plasticized, melted and stored in the screw cylinder 53 reaches the set weight value. Once reached, the drive of the hydraulic motor 82 is stopped, and then
Plunger 65 of injection cylinder 57 is raised. Then, the screw 54 is raised by the rise of the plunger 65, so that the screw cylinder 5
The material plasticized and stored in the mold 3 is injected into the cavity between the upper mold 30 and the lower mold 29.

After injection, when the molten material in the cavity has hardened, the upper mold 30 is raised, the product is taken out, the mold is clamped again, and the above-described operation is repeated. Injection molding is performed in this manner.

By the way, when the clamp cylinders 46A and 46B are extended and moved when inspecting the nozzle 62, for example, the injection part 42 swings downward about the shaft 45 as a fulcrum. In this state, if the connection between the lower ends of the clamp cylinders 46A, 46B and the bracket 47 of the injection part 42 is removed, the stopper 33 is removed, and the carriage 31 is pulled out forward along the rail 32, the injection part 42 will be connected to the machine. Since the nozzle 62 is exposed to the front, inspection and repair of the nozzle 62 and the like can be easily performed. Furthermore, if the bolt 61 is removed in this state, the screw 54 can be pulled upward together with the screw cylinder 53 and the cylinder holding cylinder 51.
It is also possible to exchange 4.

Therefore, according to this embodiment, the in-line screw type injection device 41 in which the hydraulic motor 82 is disposed to drive the screw 54 in a direction orthogonal to the axis of the vertical screw 54 is used in the plastic injection molding machine. Therefore, the height of the injection unit 41 of the hydraulic motor 41 can be reduced, and the overall height of the rigid injection molding machine can be reduced, and the height of the work surface can also be reduced. Of course, since the injection direction is the rigid direction, general molds can also be used.

In addition, it is an in-line screw type in which the feed screw 72 feeds the material into the screw cylinder 53, and the material is plasticized and melted by the rotation of the screw 54 inside the screw cylinder 53.
It can also be applied to thermosetting resins. In other words, since the melting path of the material is short, it can also be applied to thermosetting resins.

Moreover, since the in-line screw type injection device 41 is mounted on the trolley 31, the trolley 31 is mounted on the rail 31.
If the injection unit 4 of the injection device 41 is moved along the
2 can be moved to the front of the machine, inspection work of the nozzle 62 of the injection section 42, etc. can be easily performed.

Furthermore, in this state, by removing the bolt 61, the screw 54 can be pulled upward together with the screw cylinder 53 and the cylinder holding cylinder 51, so that the screw 54 can be easily replaced.

[Effect of idea]

As described above, according to the present invention, it is possible to provide a rigid injection molding machine that can reduce the overall height of the machine and improve workability while assuming use in general molds. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the rigid injection molding machine of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a sectional view showing an in-line screw type injection device. 21... Mold clamping device, 29... Lower mold, 30... Upper mold, 41... In-line screw type injection device, 5
3...Scrill cylinder, 54...Scrill cylinder, 5
7...Injection cylinder, 82...Hydraulic motor, 86
...Reduction mechanism.

Claims (1)

[Claims for Utility Model Registration] In a rigid injection molding machine in which a pair of molds are clamped by a mold clamping device in the vertical direction, a screw cylinder is arranged below the mold clamping device in the vertical direction; A screw is housed in the screw cylinder so as to be rotatable and move forward and backward in the vertical direction, and the material is placed on the axis of the screw and plasticized through the screw into the cavity formed in the pair of molds. An in-line screw type injection device including an injection cylinder for injecting to the screw, and a drive source arranged in a direction perpendicular to the axis of the screw and rotating the screw via a deceleration mechanism is provided, and the in-line screw type injection The device is mounted on a trolley movably provided below the mold clamping device, and the speed reduction mechanism to which rotational force is transmitted from the drive source is composed of a gear train of a plurality of gears. A spline shaft is inserted through the gear on the screw side, and the upper end of this spline shaft is connected to the screw, and the lower end is in contact with an elevating plate that is moved up and down by the plunger of the injection cylinder, and the spline shaft is connected to the screw. A rigid injection molding machine characterized in that the cylinder holding tube into which the reduction mechanism is inserted is detachably attached to a gear case in which the reduction mechanism is housed with a bolt.