JP3737263B2 - Guide rod structure of injection unit in vertical injection molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a guide rod structure of an injection unit in a vertical injection molding machine.
[0002]
[Prior art]
A vertical injection molding machine in which an injection unit is attached to a guide rod erected on a platen is known. An outline of a guide rod structure of a conventional vertical injection molding machine is shown in a sectional view of FIG.
[0003]
In FIG. 3, reference numeral 1 denotes a platen of a vertical injection molding machine, and a description of a tie bar, a mold clamping mechanism, and a base portion located below the platen is omitted. As shown in FIG. 3, in the conventional vertical injection molding machine, the two guide rods 3 for mounting the injection unit 2 are integrally formed, and are erected on the platen 1 with bolts or the like. Has been.
[0004]
The injection unit 2 includes a front plate 6 to which an injection cylinder 5 in which an injection screw 4 is fitted is attached, a rear plate 7 that is integrally fixed to the front plate 6 via a tie rod (not shown), and the front plate 6 and the rear plate. 7 and a pusher plate 8 that is slidably attached to the tie rod. A metering rotation drive mechanism 9 for rotating the injection screw 4 is provided on the pusher plate 8. Further, an injection drive mechanism 10 for moving the pusher plate 8 toward and away from the rear plate 7 is provided between the pusher plate 8 and the rear plate 7.
[0005]
That is, the injection screw 4 is rotated by the metering rotation drive mechanism 9 on the pusher plate 8, and the forward and backward movement of the injection screw 4 is performed for injection provided between the pusher plate 8 and the rear plate 7. The pusher plate 8 is moved toward and away from the rear plate 7 by the drive mechanism 10 so that the injection screw 4 is moved back and forth integrally with the metering rotation drive mechanism 9.
[0006]
Further, the sprue break and nozzle touch operation of the nozzle 13 with respect to the upper mold (not shown) mounted on the lower surface of the platen 1 moves the injection unit 2 composed of the front plate 6, the pusher plate 8, the rear plate 7 and the like up and down as a whole. A hopper 11 for supplying resin pellets to an injection cylinder 5 attached to the front plate 6 is attached to the front plate 6 via a resin supply pipe 12 and is moved to the front plate 6. 6 is configured to move up and down integrally.
[0007]
Among these types of vertical injection molding machines, the lower mold fixed / upper movable type, that is, the vertical injection molding machine in which the platen 1 moves up and down is taken into consideration for the stability of loading. Then, the mold thickness adjusting portion is clamped to the minimum mold thickness, and the injection unit 2 is lowered as shown in FIG. 4, that is, the height of the platen 1 is made as low as possible, and Although the center of gravity is moved downward as much as possible, the injection unit 2 is lowered only by means for moving the center of gravity of the vertical injection molding machine downward. As shown in FIG. 4, even if the injection unit 2 is lowered, the length L itself of the portion protruding upward from the platen 1 cannot be shortened.
[0008]
On the other hand, because the height of the cargo during in-vehicle transportation is restricted by regulations such as the Road Traffic Law, for example, when the ground height of the cargo exceeds 3.8 meters, This procedure is troublesome.
[0009]
In such a case, in many cases, the injection unit 2 and the two guide rods 3 for mounting the injection unit 2 are separated from the platen 1 and transported on the vehicle as they are. A crane or the like is required, and assembly work becomes difficult unless an appropriate crane is deployed in the factory of the transportation destination.
[0010]
In addition, the initial accuracy at the time of shipment may be impaired by the detaching operation of the injection unit 2, a skilled worker may be required for reassembly, and further, reinspection may be required. There is a demand for transporting a vertical injection molding machine without carrying out a large-scale disassembly and assembly work and without a troublesome reporting work.
[0011]
If the height of the truck bed is assumed to be 1 m, the height of the load allowed for transportation will be up to 2.8 m, and it is possible to carry without disassembling the injection unit 2 at present. A vertical injection molding machine having a clamping capability of about 50 tons is the limit. If it is of 100 ton class, the total height will exceed about 50 cm, and the injection unit 2 will be forced to be removed.
[0012]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to eliminate the drawbacks of the prior art and to provide a guide rod structure for an injection unit in a vertical injection molding machine that can carry a tall vertical injection molding machine without removing the injection unit. It is to provide.
[0013]
[Means for Solving the Problems]
The present invention is a vertical injection molding machine in which an injection unit is attached to a guide rod standing on a platen so as to be slidable in the vertical direction, and protrudes upward from the injection unit in a state where the injection unit is lowered most. The above object has been achieved by a structure characterized in that the guide rod portion is divided and configured to be removable.
[0014]
So as to couple it provided the fitting hole of the small diameter portion to the other one of the detachable unit which connects to the fixed portion and said fixing portion for fixing the platen guide rods obtained by dividing this. Further, a rectangular through groove in the diametrical direction is formed on one end face of the fixing part and the detachable part, and a rectangular protrusion in the diametrical direction is formed on the other end face to be connected.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a main part of a vertical injection molding machine according to an embodiment to which the present invention is applied, that is, a structure around an injection unit 2.
[0016]
The structure of the injection unit 2 itself, that is, the front plate 6, the rear plate 7, the pusher plate 8, the hopper 11, the resin supply pipe 12, the metering rotation drive mechanism 9, the injection drive mechanism 10, the injection cylinder 5, the injection screw 4, Since each part of the nozzle 13 and the structure of the platen 1 are the same as those in the conventional example shown in FIG. 3, detailed description thereof is omitted here.
[0017]
FIG. 2 is a cross-sectional view showing the main part of a guide rod 3 for attaching and injecting the injection unit 2 to the platen 1, and in this embodiment, as shown in FIG. The fixing part 3a on the side fixed to the one side and the detachable part 3b detachable from the fixed part 3a are divided.
[0018]
As in the case of the conventional vertical injection molding machine shown in FIG. 3, the fixing portion 3a constituting a part of the guide rod 3 is integrated on the platen 1 by fixing means such as bolts passed from the lower surface side of the platen 1. To stand up. In addition, a fitting hole 15 for fitting a small diameter portion 14 formed at the lower end of the attaching / detaching portion 3b constituting the other portion of the guide rod 3 is formed in the upper end surface of the fixing portion 3a. Center alignment with the detachable portion 3b and straightening are performed. The diameters of the fixed portion 3a and the detachable portion 3b are the same.
[0019]
In this embodiment, the small diameter portion 14 of the detachable portion 3b is inserted into the fitting hole 15 of the fixed portion 3a, and the tip of the bolt 17 passed through the screw through hole 16 penetrating the center of the detachable portion 3b is fixed to the fixed portion 3a side. The detachable portion 3b is attached to the fixed portion 3a by being screwed to the female screw 18, and a male screw and a female screw are formed directly on the outer periphery of the small diameter portion 14 and the inner periphery of the fitting hole 15, It is also possible to perform the joining operation by screwing the two together.
[0020]
In addition, when an assembly jig is provided by temporarily mounting a sleeve having a matching diameter on the outer periphery of the joint between the fixed portion 3a and the detachable portion 3b, the end surface on the fixed portion 3a side is diametrically aligned. The rectangular through-grooves may be engraved, and the both sides of the end face on the side of the detachable portion 3b may be scraped to form a rectangular projection in the diameter direction at the center. Of course, the reverse is also possible.
[0021]
In this embodiment, in order to ensure that the centering and straightening of the detachable part 3b with respect to the fixing part 3a can be performed without using a jig, a fitting part (small diameter part 14 and fitting hole 15 between them) is used. ) And fixing means (bolt 17 and female screw 18) between them.
[0022]
The total length of the guide rod 3, that is, the total length of the fixed portion 3a and the effective length of the detachable portion 3b is determined according to the stroke required for the vertical movement of the injection unit 2. In the example of FIG. 1, the length is L.
[0023]
Further, as shown in FIG. 1, the length of the fixed portion 3a is determined according to the separation distance (L-t) from the platen 1 to the rear plate 7 with the injection unit 2 lowered most. It is designed so that there is no portion protruding above the rear plate 7 with the detachable portion 3b removed. Therefore, as a result, the effective length of the detachable part 3b is t in the example of FIG.
[0024]
However, such a configuration is for carrying out the transportation work while reducing the height of the vertical injection molding machine to the minimum without removing the injection unit 2 from the platen 1. Is shortened by t 'shorter than t, it is not always necessary to divide the detachable part 3b at the position t, but rather t' shorter than this. It is more reasonable to divide the detachable part 3b at the position.
[0025]
As a result, there is an advantage that the rear plate 7 is prevented from being rubbed by a minute step at the coupling portion between the fixed portion 3a and the detachable portion 3b during nozzle touch or sprue break operation (sliding contact of the rear plate 7). In addition, when the fixed portion 3a is made slightly longer, there is almost no influence on the vertical center of gravity movement in the vertical injection molding machine, and stable transportation work is not hindered. Even if the length of the fixing portion 3a required for the nozzle touch or the sprue break operation is sufficient (L-t '), the position of the injection unit 2 is higher than that when the nozzle 13 or the screw 4 is replaced. Therefore, the total length of the guide rod 3 is only L (not cutting the tip of the guide rod 3 by t ′ does not solve the problem).
[0026]
Also, dividing the tip of the guide rod 3 at a position longer than t is not desirable because it affects the assembly of the injection unit 2 (particularly the rear plate 7).
[0027]
When transporting the vertical injection molding machine of the present embodiment in an automobile or the like, as shown in FIG. 1, the injection unit 2 is lowered as much as possible, the bolt 17 is removed, and the detachment that is a part of the guide rod 3 The part 3b is removed to lower the overall height of the vertical injection molding machine.
[0028]
As a result, a tall vertical injection molding machine (for example, 100 ton class), which has been conventionally regulated by the Road Traffic Act or otherwise required special notification work with the Land Transport Bureau, is transported without troublesome reporting. It becomes possible to do.
[0029]
Further, since it is not necessary to remove and transport the injection unit 2 from the platen 1 as in the prior art, the shipping operation of the vertical injection molding machine is greatly simplified, and the guide rod 3 and the platen 1 are transported to the platen 1 at the transportation destination. There is no need to reassemble the injection unit 2, and it is only necessary to couple the detachable part 3b to the fixed part 3a of the guide rod 3, so that it is not necessary to send a skilled worker to the site, and it is ensured at the time of shipment. The initial assembly accuracy was guaranteed.
[0030]
Of course, the loading and unloading operation of the vertical injection molding machine itself requires a crane or the like, but it is not necessary to lift the injection unit 2 with a crane or the like and position it precisely on the platen 1 as in the conventional case. Even if the accuracy of a crane or the like installed at the transportation destination is insufficient, there is no problem in practical work.
[0031]
As mentioned above, although the structure which divides the guide rod 3 into 2 was described as one Embodiment, if necessary, this can also be divided into 3 or more.
[0032]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, a tall vertical injection molding machine can be conveyed, without removing an injection unit or performing troublesome report work with respect to a land transport station etc.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main part of a vertical injection molding machine according to an embodiment to which the present invention is applied.
FIG. 2 is a cross-sectional view showing a guide rod structure adopted in the embodiment.
FIG. 3 is a cross-sectional view schematically showing a guide rod structure of a conventional vertical injection molding machine.
FIG. 4 is a view showing a state of an injection unit when a conventional vertical injection molding machine is transported.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Platen 2 Injection unit 3 Guide rod 3a Fixing part 3b Desorption part 4 Injection screw 5 Injection cylinder 6 Front plate 7 Rear plate 8 Pusher plate 9 Measuring rotation drive mechanism 10 Injection drive mechanism 11 Hopper 12 Resin supply pipe 13 Nozzle 14 Small diameter Part 15 Mating hole 16 Screw through hole 17 Bolt 18 Female thread

Claims (3)

In a vertical injection molding machine in which an injection unit is mounted on a guide rod standing on a platen so as to be slidable in the vertical direction, a portion of the guide rod that protrudes upward from the injection unit with the injection unit lowered most A guide rod structure for an injection unit in a vertical injection molding machine, characterized in that it is configured to be detachable by splitting. 2. The guide rod structure according to claim 1, wherein the guide rod includes a fixed portion and a detachable portion, and a small diameter portion is provided in one of the fixed portion and the detachable portion, and a fitting hole is provided in the other. The guide rod is composed of a fixed part and a detachable part, a rectangular through-groove in the diametrical direction is engraved on one end face of the fixed part and the detachable part, and a rectangular protrusion in the diametrical direction is formed on the other end face. The guide rod structure according to claim 1 .

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