JPH0466167B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to an injection device equipped with a plunger extrusion type hopper in which a plunger extrudes a molding material housed in a cylinder hopper and supplies it into a heating cylinder. In particular, the present invention relates to a technique for facilitating the supply of molding material into a cylinder hopper and the cleaning of the inside of a cylinder hopper.

(Prior art) In an injection device that targets molding materials such as BMC (BULK MOLDING COMPOUND) and silicone rubber, the molding material contained in the hopper may not stabilize in the heating cylinder due to the natural fall of the molding material. It cannot be expected that the supply of Therefore, those
When molding materials such as BMC or silicone rubber are used, generally, (a) a silicon hopper is connected to the material supply port of the heating cylinder at the lower opening, and (b) the cylinder hopper is inserted into the cylinder hopper. (c) a plunger elevating means for elevating and lowering the plunger; (d) the plunger is capable of being raised and lowered above the cylinder hopper; Generally, an injection device is used which includes a plunger extrusion type hopper and a plunger support mechanism that supports the plunger. According to an injection device equipped with such a plunger extrusion type hopper, even when molding materials such as BMC or silicone rubber are to be used, the molding material housed in the cylinder hopper can be forcibly extruded by the plunger. This makes it possible to stably supply the molding material into the heating cylinder.

Conventionally, in an injection device equipped with such a plunger extrusion type hopper, molding material is replenished into the cylinder hopper while the plunger is pulled out from the cylinder hopper and retracted above the cylinder hopper. Also, the inside of the cylinder hopper was cleaned.

(Problem to be solved) To achieve this, in conventional injection devices equipped with this type of plunger extrusion type hopper, the vertical stroke of the plunger is increased to facilitate the supply of molding material into the cylinder hopper and the cleaning of the inside of the cylinder hopper. If you try to achieve this, the overall height of the injection device will inevitably increase, which will be disadvantageous in terms of the installation space of the injection device.On the other hand, if you reduce the vertical stroke of the plunger in order to lower the overall height of the injection device, the height above the cylinder hopper will increase. There was a problem in that the space became narrow, making it difficult to supply molding material into the cylinder hopper and to clean the inside of the cylinder hopper.

The present invention was made against this background, and its first purpose is to:
To provide an injection device equipped with a plunger extrusion type hopper, which can easily supply molding material into the cylinder hopper and clean the inside of the cylinder hopper while keeping the overall height of the injection device low.

A second object of the present invention is to provide a plunger extrusion type which is capable of automating the supply of molding material into the cylinder hopper by providing a spare hopper in the cylinder hopper for replenishing the molding material. To provide an injection device equipped with a hopper in which the inside of a cylinder hopper can be easily cleaned while keeping the overall height of the injection device low.

(Solution Means) In order to achieve the first object, the present invention includes (a) a cylinder hopper, (b) a plunger, and (c) plunger lifting means, as described above.
(d) In an injection device equipped with a plunger support mechanism, the plunger support mechanism can be placed in an operating position in which the plunger is located above the cylinder hopper and can plunge into the cylinder hopper, and in an operating position in which the plunger is located above the cylinder hopper and can be pushed into the cylinder hopper. In addition to providing guide means for horizontally guiding the plunger support mechanism between the retracted position and the retracted position, the plunger support mechanism is also provided with moving means for moving the plunger support mechanism between the operating position and the retracted position.

In addition, in order to achieve the second objective, in an injection device including (a) a cylinder hopper, (b) a plunger, (c) a plunger elevating means, and (d) a plunger support mechanism, the plunger support mechanism is On the other hand, while attaching a spare hopper for supplying molding material to the cylinder hopper, the plunger support mechanism is set to an operating position where the plunger is located above the cylinder hopper and can plunge into the cylinder hopper, and another where the spare hopper is located above the cylinder hopper. a guide means for horizontally guiding the plunger and the reserve hopper between a material supply position where the plunger and the spare hopper are both laterally removed from above the cylinder hopper; A moving means is provided for moving the plunger support mechanism between the operating position, the material replenishment position, and the retreat position.

(Operation/Effect) According to the former injection device, the upper opening of the cylinder hopper can be opened by moving the plunger support mechanism from its operating position to its retracted position in the horizontal direction using the moving means. In other words, the upper opening of the cylinder hopper can be opened without increasing the vertical stroke of the plunger more than necessary. Therefore, while keeping the overall height of the injection device low, molding material can be supplied to the cylinder hopper and inside the cylinder hopper. This makes it easier to clean the area.

According to the latter of the above injection devices, a preliminary hopper is attached to the plunger support mechanism, and the preliminary hopper can supply molding material to the cylinder hopper based on movement of the plunger support mechanism by the moving means. Since the cylinder can be moved to the replenishment position, by storing the molding material in the preliminary hopper in advance, the molding material can be automatically replenished into the cylinder hopper.

On the other hand, in the latter injection device, the plunger support mechanism is moved horizontally by the moving means,
By moving the plunger support mechanism to its retracted position, both the plunger and the spare hopper can be retracted to a position laterally removed from above the cylinder hopper, which prevents the plunger movement stroke talk from becoming larger than necessary. Therefore, the upper opening of the cylinder hopper can be opened.

In other words, according to the latter injection device, a spare hopper can be provided to automate the supply of molding material to the cylinder hopper, and the inside of the cylinder hopper can be easily cleaned while keeping the overall height of the injection device low. becomes possible.

(Examples) Hereinafter, in order to clarify the present invention more specifically, examples thereof will be described in detail based on the drawings.

First, in FIG. 1, reference numeral 10 denotes a heating cylinder having an injection nozzle 12 at its tip, and is supported by a common base 14 at its base end. An injection screw 16 is inserted into the heating cylinder 10 in a rotatable and axially movable state, and based on the rotational operation and the movement operation of the injection screw 16 in the axial direction, A predetermined injection operation is performed.

The injection screw 16 is here rotated by a hydraulic motor 20 attached to a bearing box 18 that rotatably supports the injection screw 16, and the common base 14 and the bearing box 18 are connected to each other. The injection cylinder 22 is connected to the injection cylinder 22 so that the injection cylinder 22 can be moved in the axial direction.
Further, here, the common base 14 that supports the heating cylinder 10 and the bearing box 18 that supports the injection screw 16 can be directly slid on the slide base 24.

Here, the common base 1 at the base end of the heating cylinder 10 is
The part supported by 4 has common base 1
A material supply port 26 for supplying molding material into the heating cylinder 10 is formed in the upper surface of the common base 14 and is connected to the material supply port 26 at the lower end opening. In the state
A cylindrical cylinder hopper 28 is provided upright.
A plunger 30 can be pushed into the cylinder hopper 28, and the thrust of the plunger 30 causes the cylinder hopper 28 to be pushed into the cylinder hopper 28.
A molding material such as BMC or silicone rubber contained therein is forced into the heating cylinder 10 from its lower end opening through the material supply port 26.

That is, above the cylinder hopper 28 is provided a support plate 34 whose four corners are supported by four support rods 32 and together with these support rods 32 constitute a plunger support mechanism. On the other hand, a cylinder 38 is erected with a piston rod 36 passing through the support plate 34 downwardly. The plunger 30 is attached to the tip of the piston rod 36 of the cylinder 38, so that when the piston rod 36 of the cylinder 38 protrudes, the plunger 30
can be thrust into the cylinder hopper 28. Furthermore, as is clear from this,
In this embodiment, the cylinder 38 constitutes plunger lifting means.

By the way, on the upper surface of the common base 14, there is a first
As shown in FIGS. 3 to 3, a pair of guide rails 40, 40 are provided that extend for a predetermined length in a horizontal direction orthogonal to the heating cylinder 10, with the cylinder hopper 28 sandwiched therebetween. On the other hand, four support rods 32 supporting the support plate 34
are attached to both ends of a pair of parallel connecting plates 42, 42 at their lower ends, and are slidably fitted to the guide rails 40, 40 via these connecting plates 42, 42. It is attached to each pair of guides 44, 44. As a result, the plunger 30
The support plate 34 is located between an operating position where the plunger 30 is located above the cylinder hopper 28 and can plunge into the cylinder hopper 28 and a retracted position where the plunger 30 is laterally removed from above the cylinder hopper 28.
is adapted to be guided in the horizontal direction.

Here, as shown in FIGS. 2 and 3, one of the connecting plates 42 and a bracket 46 disposed below the guide rail 40 to support and reinforce the guide rail 40. A cylinder 48 is disposed in such a manner that the support plate 34 is moved between the operating position and the retracted position.

In addition, in FIGS. 1 to 3, 50 is a bracket for connecting the piston rod 52 of the cylinder 48 to the connecting plate 42, and 53 is a bracket for connecting the piston rod 52 of the cylinder 48 to the connecting plate 42.
is a guide member for guiding the bracket 50 along the side surface of the bracket 46.

Furthermore, as is clear from the above description, in this embodiment, the pair of guide rails 40, 40,
A guide 44 is attached to these guide rails 40, 40,
A pair of connecting plates 42, 42 which are slidably fitted together via 44 constitute a guide means, and the cylinder 48 constitutes a moving means.

In this type of injection device, by lowering the plunger 30 with the cylinder 38 while the support plate 34 is moved to the above-mentioned operating position with the cylinder 48 serving as a moving means, as in the conventional injection device of this type, The molding material such as BMC or silicone rubber contained in the cylinder hopper 28 can be stably supplied to the heating cylinder 10.

On the other hand, in such an injection device, when it becomes necessary to reinforce the molding material inside the cylinder hopper 28 or when it becomes necessary to clean the inside of the cylinder hopper 28, the plunger 30 is moved by the cylinder 38 as a means for raising and lowering the plunger. When the cylinder 4 is pulled out from the cylinder hopper 28,
8 to move the support plate 34 to the retracted position. In this way, the upper opening of the cylinder hopper 28 can be completely opened, so that molding material can be easily replenished into the cylinder hopper 28, and the inside of the cylinder hopper 28 can be easily cleaned. It is.

By the way, as described above, the apparatus of this embodiment opens the upper opening of the cylinder hopper 28 by moving the support plate 34 in the horizontal direction, that is, by moving the plastic gear 30 in the horizontal direction, and molds into the cylinder hopper 28. Since the material can be easily supplied and the inside of the cylinder hopper 28 can be easily cleaned, unlike the conventional apparatus, the molding material can be easily supplied into the cylinder hopper 28 and the inside of the cylinder hopper 28 can be easily cleaned. In order to do this, there is no need to make the vertical stroke of the plunger 30 larger than necessary so that the plunger 30 can rise more than necessary, and the plunger 30 can simply be pulled upward from the cylinder hopper 28. good. Therefore, compared to this type of conventional device, the holding position of the support plate 34 can be set lower, and the length of the cylinder 38 as a means for raising and lowering the plunger can also be shortened. Compared to
The overall height of the injection device can also be significantly reduced.

Next, another embodiment of the present invention is shown in FIGS. 4 and 5.
This will be explained based on the diagram. Here, only the parts that are different from the embodiment described above will be described in detail, and the parts similar to the embodiment described above will be denoted by the same reference numerals as in the embodiment described above, and detailed explanation will be omitted.

That is, as shown in FIGS. 4 and 5, in the injection device of this embodiment, both ends in the longitudinal direction are supported by brackets 54, 54, and the central part in the longitudinal direction is supported by the cylinder hopper 28.
A plate member 56 in the form of a longitudinal rectangular plate is disposed in parallel with the guide rails 40, 40, and is supported by the upper end surface of the plate member 56. A cutout hole 58 corresponding to the upper opening of the cylinder hopper 28 is formed in the plate member 56, and the plunger 30 is inserted into the cylinder hopper 28 through the cutout hole 58.

At both ends of the plate member 56 in the width direction,
Guide members 60, 60 are disposed over substantially the entire length of the plate member 56, and guide grooves 62, 62 with a U-shaped cross section facing each other are formed between these guide members 60, 60 and the plate member 56. It is formed. Then, the lower flange portion 64 provided at the lower end peripheral portion is inserted into the guide grooves 62, 62, and is guided in the longitudinal direction of the plate member 56 by the guide grooves 62, 62.
A preliminary hopper 66 having a lower opening substantially similar to the upper opening of the cylinder hopper 28 is provided.

This preliminary hopper 66 is attached to the support plate 34 that supports the plunger 30 at an upper flange portion 68 provided at the periphery of the upper opening.
That is, the plate member 56 can be moved integrally with the support plate 34 in the longitudinal direction. When the plate member 56 removed from above the cylinder hopper 28 is moved to both ends, the lower opening is closed by the plate member 56 to hold the molding material inside. When moved upwardly, the molding material contained therein is fed from the lower opening into the cylinder hopper 28 through the cutout hole 58 of the plate member 56.

By the way, here, the guide rails 40, 40
However, the length is set such that the preliminary hopper 66 can be guided from one end of the plate member 56 in the longitudinal direction to the other end, and the cylinder 48 as a moving means is
The length is set such that the preliminary hopper 66 can be moved from one end of the plate member 56 in the longitudinal direction to the other end, and when the piston rod 52 of the cylinder 48 is retracted to its retracted end position, the preliminary hopper 66 moves from one end of the plate member 56 to the other end. In the state where the plunger 30 is started at one end side, the plunger 30 engages the cylinder hopper 2.
It is designed so that it can be moved to a position where it can be inserted into the interior. From this state, cylinder 4
When the piston rod 52 of No. 8 is protruded a certain distance, the reserve hopper 66 is moved above the cylinder hopper 28 in place of the polungeer 30 so that molding material can be supplied into the cylinder hopper 28, and from this protruding position. When the piston rod 52 is further protruded to its protruding end position, the reserve hopper 66 is moved to the other end of the plate member 56, and the upper opening of the cylinder hopper 28 is opened. ing.

Therefore, in this embodiment, during normal injection molding, the plunger 30 is supported between the position where it is held above the cylinder hopper 28 and the position where the preliminary hopper 66 is held above the cylinder hopper 28. By moving the plate 34, the molding material can be automatically reinforced from the preliminary hopper 66 into the cylinder hopper 28, and when it becomes necessary to clean the cylinder hopper 28, The piston rod 52 of the cylinder 48 is projected to its protruding end position, and the preliminary hopper 66 is inserted into the plate member 5.
By moving the cylinder hopper 6 to the other end side and opening the upper opening of the cylinder hopper 28, the inside of the cylinder hopper 28 can be easily cleaned.

In the device of this embodiment, as in the device of the above embodiment, the plunger 30 is moved in the horizontal direction due to the movement of the support plate 34 in the horizontal direction.
Since the upper opening of the cylinder hopper 28 is open, the overall height of the injection device can be made significantly lower than that of this type of conventional device, similar to the device of the embodiment described above.

Furthermore, as is clear from Fig. 5, here,
Each connecting plate 42, 42 has three guides 44
It is fitted into each corresponding guide rail 40, 40 via.

Furthermore, as is clear from the above description, the operating position, material replenishment position, and retracted position of the support plate 34 in this embodiment, that is, the plunger support mechanism, are the position where the plunger 30 is held above the cylinder hopper 28, and the standby position, respectively. Hotsupa 66
and a position where both the plunger 30 and the spare hopper 66 are held at a position removed from above the cylinder hopper 28 to open the upper opening of the cylinder hopper 28.

Although several embodiments of the present invention have been described in detail above, these are literal illustrations, and it goes without saying that the present invention should not be interpreted as being limited to these specific examples.

For example, in the embodiment described above, the upper opening of the cylinder hopper 28 was opened by retracting the plunger 30 in the horizontal direction perpendicular to the heating cylinder 10.
The retraction direction does not necessarily have to be perpendicular to the heating cylinder 10, and can be changed as necessary.

Further, in the above embodiment, the support plate 34 is moved to the retracted position at the protruding end position of the piston rod 52 of the cylinder 48, which is the moving means, but the support plate 34 is retracted at the retracted end position of the piston rod 52. It is also possible to move it to a different position.

Furthermore, in the second embodiment, the spare hopper 6
Although the lower end of the plate member 56 is guided in the longitudinal direction of the plate member 56 by the guide members 60, 60, it is also possible to adopt a structure in which such guide members are omitted.

In addition, although it is omitted to list specific examples such as the structure of the guide means, it is understood that the present invention can be practiced with various changes, modifications, and improvements without departing from the spirit thereof. , it goes without saying.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an example of an injection device according to the present invention, and FIG. 2 is a plan view of essential parts of the injection device in FIG. 1 in an operating state different from that in FIG. 1. , FIG. 3 is a front view of main parts of the injection device shown in FIG. 2. FIG. 4 is a front main part view corresponding to FIG. 1 showing another embodiment of the present invention, and FIG.
The figure is a left side view of FIG. 4. 10...Heating tube, 26...Material supply port, 28...
...Cylinder hopper, 30...Plunger, 32...
...Support rod, 34...Support plate, 38...
Cylinder (plunger elevating means), 40... Guide rail, 42... Connection plate, 44... Guide, 48... Cylinder (moving means), 56... Plate member, 58... Cutout hole, 60... Guide member , 66... Reserve hoppa.

Claims (1)

[Scope of Claims] 1. (a) A cylinder hopper connected to a material supply port of a heating cylinder at a lower opening; (b) A cylinder hopper inserted into the cylinder hopper to supply the molding material contained in the cylinder hopper. A plunger for pushing into the heating cylinder through the opening; (c) plunger lifting means for raising and lowering the plunger; and (d) a plunger support mechanism for supporting the plunger so that it can rise and fall above the cylinder hopper. In the injection device, the plunger support mechanism has two positions: an operating position where the plunger is located above the cylinder hopper and can plunge into the cylinder hopper, and a retracted position where the plunger is removed from above the cylinder hopper and located to the side. A plunger push-out type hopper is provided, characterized in that it is provided with a guide means for horizontally guiding the plunger support mechanism between the operating position and the retracted position, and a moving means for moving the plunger support mechanism between the operating position and the retracted position. injection device. 2. (a) A cylinder hopper connected to the material supply port of the heating cylinder at the lower opening; (b) A cylinder hopper that is inserted into the cylinder hopper and supplies the molding material contained in the cylinder hopper through the material supply port into the heating cylinder. An injection device comprising: a plunger for pushing the plunger into the cylinder; A preliminary hopper for supplying molding material to the cylinder hopper is attached to the support mechanism, and the plunger support mechanism is placed in an operating position in which the plunger is located above the cylinder hopper and can plunge into the cylinder hopper. , between a material replenishment position where the spare hopper is located above the cylinder hopper and can supply molding material into the cylinder hopper, and a retracted position where both the plunger and the spare hopper are laterally removed from above the cylinder hopper. A plunger push-out type hopper is provided, characterized in that a guide means for horizontally guiding the plunger support mechanism is provided, and a moving means is provided for moving the plunger support mechanism between an operating position, a material replenishment position, and a retreat position. injection device.