JPH05333Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an in-line screw type injection device. In particular, the present invention relates to an in-line screw type injection device suitable for a vertical injection molding machine in which the clamping direction of a pair of molds by a mold clamping device is the vertical direction.

[Conventional technology]

Conventionally, vertical injection molding machines in which the clamping direction of a pair of molds by a mold clamping device is the vertical direction include those in which the injection device is installed vertically 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 total height of the machine is high relative to its capacity because the injection device is located vertically in 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.

Although the latter can reduce the overall height of the machine, since the injection is from the parting line of the mold, it is not possible to use a general mold, that is, a mold in which the material flow path is formed at right angles to the parting line. There is a drawback that it cannot be used.

The purpose of this invention is to reduce the overall height of the machine when used in a vertical injection molding machine.
Another object of the present invention is to provide an in-line screw type injection device that can also be used with general molds.

[Means for solving problems]

Therefore, in the present invention, a screw cylinder is arranged in the vertical direction, a screw is housed in the screw cylinder so as to be rotatable and can move forward and backward in the vertical direction, and a screw is arranged on the axis of the screw and is inserted through the screw. The invention is characterized by comprising an injection cylinder that injects plasticized material, 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 allows the overall height of the machine to be reduced when used in a vertical injection molding machine. Furthermore, since the injection direction is vertical, a general mold can also be used.

〔Example〕

Hereinafter, an embodiment in which the injection device of the present invention is applied to a vertical injection molding machine will be described based on the drawings.

FIG. 1 shows a cross section of the same vertical injection molding machine, and FIG. 2 shows its front view. In these figures, a mold clamping device 21 is installed on the upper part of a frame 11 formed in a substantially box shape, 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 trolley 3
A stopper 33 is provided for holding the mold 1 in a predetermined position, that is, the injection device 41 provided on the carriage 31 in a predetermined position with respect 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 supplied material vertically upward, plasticizes and measures the supplied material, and injects the material into the cavity 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 into contact with the lower die 29 through a through hole position 2 formed through the center of the fixed platen 22. Heater 6 on the outer surface
3 is provided. At the lower end of the screw 54,
A spline shaft 64 coaxial with the axis of the screwdriver 54 and passing through the gear case 55 is integrally connected. 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 5 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 cylinder 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 cylinder 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 vertical injection molding machine can be reduced, and the height of the working surface can also be reduced. Since the injection direction is vertical, a general mold 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 in front of the machine,
Inspection of the nozzle 62 of the injection section 42 and the like can also 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.

Note that although the above embodiment is an example in which the in-line screw type injection device 41 is provided below the mold clamping device 21, the same applies when the in-line screw type injection device 41 is provided above the mold clamping device 21. This effect can be achieved.

[Effect of idea]

As described above, according to the present invention, it is possible to provide an in-line screw type injection device that can reduce the overall height of the machine when used in a vertical injection molding machine, and can also be used with general molds. .

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the in-line screw type injection device of the present invention applied to a vertical injection molding machine, Fig. 2 is its front view, and Fig. 3 shows the in-line screw type injection device. FIG. 53... Screw cylinder, 54... Screw, 57... Injection cylinder, 82... Hydraulic motor, 86... Reduction mechanism.

Claims (1)

[Claims for Utility Model Registration] A screw cylinder arranged in the vertical direction, a screw housed in the screw cylinder so as to be rotatable and movable in the vertical direction, and a screw arranged on the axis of the screw. an injection cylinder that injects plasticized material through the screw, and a drive source that is arranged in a direction perpendicular to the axis of the screw and rotates the screw through a speed reduction mechanism, and the drive source rotates from the drive source. The speed reduction mechanism to which force is transmitted is composed of a gear train including a plurality of gears, and a spline shaft is inserted through the gear on the screw side among these gears, and the upper end of the spline shaft is connected to the screw. At the same time, the lower end comes into contact with an elevating plate that moves up and down by the plunger of the injection cylinder, and the cylinder holding cylinder into which the screw cylinder is inserted is detachably attached with bolts to the gear case in which the reduction mechanism is housed. An in-line screw type injection device characterized by: