JPS606743B2 - Molding machine with pull-button cylinder device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding machine such as a vertical die casting machine having a Brubuck ram cylinder device.

The mold clamping device of vertical injection molding equipment lowers the movable platen using the main ram to align the movable mold and the fixed mold, and when the mold is opened, the movable platen is pulled up using a bullback ram cylinder to close the mold. It's opening.

In a vertical injection molding device having such a structure,
When the movable platen is lowered, it is necessary to lower the movable mold and the fixed mold at a high speed until just before they are brought together, and when the molds are brought together, they must be brought together slowly at a low speed.

If this configuration is not adopted, the movable mold and the fixed mold will collide violently, causing damage to both molds and other parts. Therefore,
Conventionally, while the movable platen was descending, a limit switch was activated and a valve was switched to decelerate, or a hydraulic valve was directly switched to decelerate.

However, if such a structure is adopted, the timing of switching the limit switch is difficult, and sometimes the limit switch is switched once every hour.
On two occasions, the limit switch would not switch. If the limit switch is not switched, the movable mold will collide with the fixed mold at high speed without slowing down, making a loud noise and damaging the mold. Furthermore, considering that the cushioning during mold alignment is not effective, high-speed mold clamping cannot be performed sufficiently because the mold stripping operation is performed on the safe side. Further, when switching from high-speed mold clamping to low-speed mold clamping, the speed does not change smoothly, but changes in steps, and there is a drawback that shock occurs.

On the other hand, in order to eliminate the drawbacks of the control method described above,
The inventor of the present invention previously invented a device as shown in FIGS. 1 and 2.

In FIGS. 1 and 2, reference numeral 1 denotes a fixed plate, on which a fixed mold 2 is fixed.

A cylinder platen 3 is arranged above the stationary platen 1, and both are connected by four tie bars 4. A tank 5 is provided at the upper end of the cylinder platen 3, and a main ram 6 for mold clamping is provided inside the cylinder platen 3.
are slidably fitted together, and a movable platen 7 is provided integrally with the main ram 6. The movable platen 7 is slidably attached to the tie bar 4, and a movable mold 8 is fixed to the lower surface thereof. Reference numeral 9 designates a product extrusion device, and reference numeral 10 designates a pair of bulbach ram cylinder devices provided on the left and right sides for opening molds. By the way, both of these bulbuck ram cylinder devices 10 are configured as shown in an enlarged view in FIG.

That is, the pullback ram cylinder device 10' is assembled based on the hollow pullback cylinder 11. At the lower end of this bullbuck cylinder, there is a diaphragm tortoise a formed inside it. And, facing this shibori toki la, Enoki E Yuguchi 12-1, which is also a multiple speed reduction boat.
6 are arranged in a line in the vertical direction at predetermined intervals. Out of these oil drain rows 2 to 16, throttles IT to 20 are provided in the pipes connected in parallel from the second oil drain row 3 from the bottom to the scarlet oil row 6 at the top. . Also,
A check valve 21 is interposed in the piping of the oil drain port 12 at the lowest stage, and a throttle 22 is provided to bypass this.
These pipes installed in parallel are one pipe 2.
5, it is connected to a hydraulic power source or tank (not shown). A pullback ram 23 is slidably joined inside the pullback cylinder 11, and a part of the pullback ram 23 extends upward and outward from the pullback cylinder 11. They are married through marriage.

A female thread 23a is formed on the inner surface of the pullback ram 23, and a male thread 24a formed over a certain length at the upper end of the ram rod 24 is screwed into this. By turning 23, the position of the pullback ram 23 can be adjusted in response to changes in the thickness of the mold to which it is attached by adjusting the above-mentioned screwed state and adjusting the relative vertical positional relationship between the two. By the way, as shown in FIG. 2, the outer diameter of the pullback ram 23 is set to d.
, the inner diameter of one diameter of the throttle part a is Q', and the outer diameter of the ram rod 24 is d3, then the relationship between these is d3<d.<d2.

The inner diameter of the constricted portion and the outer diameter of the pullback ram 23 is set to be slightly larger than the outer diameter of the pullback ram 23, for example, by several ribs. As the pullback ram 23 descends, the lower end of the t-pullback ram 23 moves from the upper oil drain port to 16 and 5 in order.
, 14, etc., the amount of oil discharged from the closed top pullback cylinder 11 gradually decreases, and the descending speed of the movable platen 7 gradually slows down until the scarlet oil low 2 reaches the pullback ram 23. When the movable platen and therefore the movable mold 8 are closed, the movement of the movable mold 8 stops. At this point, the ramrod 24 is moved so that the movable mold 8 and the fixed mold 2 are in contact with each other.
If you adjust the position of the pull back ram 23 in advance, the two molds will fit together quietly and will never collide. However, when this structure is adopted, adjusting the pull back ram 23 requires Since the gear 23b formed at the upper end of the ram 23 is manually turned and adjusted, not only is the adjustment work extremely troublesome, but the gears 23b provided at two locations must be adjusted to the same amount. This has the drawback of being extremely difficult and time-consuming depending on the person.

In addition, the molds to be installed come in various sizes, and since the thickness of the mold is expected to vary greatly, it is necessary to make the adjustment stroke of the pullback ram extremely long. The disadvantage is that it is expensive.

Also, one of the reasons why the height of the vertical molding machine increases due to changes in the thickness of the L mold is that the drawing part 1 of the pullback cylinder 1
This also depends on the fact that the length of 1a must be increased.

That is, when set for a thick mold, the lower end of the pullback ram 23 is at a low position, and when set for a thin mold, the lower end of the pullback ram 23 is at a high position. In the case of a thin mold, the stroke of the pullback ram becomes large. Therefore, if you forget to adjust the position of the pullback ram when replacing the mold with a thinner one after setting it for a thick mold, the lower end of the pullback ram will end up in the pullback cylinder at the lower end of the drawing part 1 (a) when the mold is clamped. It crashes into the bottom of 11.

Therefore, a structure has been adopted in which the length of the constricted portion 11a is increased to provide a margin to prevent such an accident from occurring.

Naturally, if the length of the constricted portion 11a is increased, the entire cylinder 1 will become longer, and the height of the molding machine will also increase.

Also, if the pullback ram comes out upwards from the cylinder, the range of iron engagement between the pullback ram 23 and the pullback ram will decrease by 4.0 cm in both length and area.
An accident may occur in which high-pressure hydraulic oil spouts out from between the pull-back cylinder 11 and the pull-back cylinder 11.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional molding machine.The present invention has been made to shorten the overall length of the molding machine and to provide a molding machine having a bulbuck ram cylinder device configured so that deceleration adjustment can be performed extremely easily. is intended to provide.

In order to achieve the above object, the present invention adopts a structure in which the deceleration position of the pullback ram is adjusted not by adjusting the vertical position of the pullback ram, but by changing the operating position of the deceleration boat. Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 3 explains one embodiment of the present invention.
The same parts or corresponding parts as in the figures and FIG. 2 are given the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, a deceleration position adjustment device 26 is provided at the throttle portion 11a formed in the pullback cylinder 11. The deceleration position adjustment device 26 uses the side wall of the pullback cylinder 11 to move a large number of deceleration boats 27 to 33 formed by penetrating toward the constriction portion 11a in a horizontal state and in one row or vertically. They are arranged in two rows.

Of course, as shown by dotted lines in FIG. 3, a large number of boats 34 may be provided at different levels, not on the same axis, but shifted in the horizontal direction. The other ends of these boats 27 to 34 open to another cylinder hole 35 provided adjacent to the cylinder 1.

An adjustment rod 36 is fitted into the cylinder hole 35 so as to be freely movable in the direction of the marking line. The lower end of the adjustment rod 36 is a threaded shaft 36a, and this threaded shaft 36a is screwed into a nut 37 provided integrally with the lower end of the pullback cylinder 11. It has a square shaft portion 36b projecting downward, and a rotating means (not shown) is connected to this portion to move the adjustment rod 36 up and down. A plurality of annular grooves 38 are formed on the outer circumferential surface of the upper end of the adjustment rod 36 at a predetermined pitch in the vertical direction.

These annular grooves 38 are arranged in the adjustment rod 3, respectively.
It communicates through a hole 39 of a predetermined depth formed at the upper end of the tube 6 and each through hole 40 . The hole 39 communicates with an oil drain port 41 formed in the middle of the pullback cylinder 11, and this oil drain port 41 is connected to an oil tank or a hydraulic power source (not shown).

In addition, the pull button 23 does not have an adjustment gear above.

It is integrated with Tsudo 24. Next, the operation of this embodiment configured as above will be explained. As shown in FIG. 3, when the adjustment rod 36 reaches the upper end of the cylinder hole 35, the upper two boats 27 and 28 of the boats 27 to 33 shown in solid lines are connected to the annular groove 35. through hole 4 to hole 39 at the upper end of adjustment rod 36 and oil drain port 41.
It is in a state of passing through 0 and passing through the lotus.

In this state, the pullback cylinder 11 and a tank or hydraulic power source (not shown) are in communication only via the boats 27 and 28.

Therefore, when the pull-back ram 23 descends in this state, the hydraulic oil in the cylinder 1 can only be discharged through the boats 27 and 28. Therefore, the pullback ram 23 descends and enters the throttle part 11a of the cylinder 1.
3 approaches, and as the boats 27 and 28 are flocked in order, the amount of hydraulic oil discharged from the sill 11 gradually decreases, and when the second boat 28 is blocked, there is no flow of hydraulic oil at all, and the pullback ram 23 stops descending, the movable platen, and therefore the movable mold 8 stops descending. If this position is set as the mold clamping position, the molds will be clamped when the fixed mold 2 and the movable mold 8 come into contact, and the molds will not collide with each other. In this way, when the boats 27 and 28 located above perform a deceleration action, when the mold is thick, the pullback ram 2
This is the case where the downward stroke of No. 3 is small.

If the thickness of the mold is thin, rotate the adjustment rod 36 in the direction in which the rod descends so that one of the boats 29 to 33 located below that matches the thickness of the mold will be blocked last. Just adjust it.

That is, the stroke of the pullback ram 23, that is, the deceleration position, can be adjusted by simply raising and lowering the adjustment rod 36 of the deceleration position adjustment device 26 and selecting the position where the deceleration boat is blocked.

Note that at least one set of bullback ram cylinder devices is provided, but if the cylinders on the other side of the bullback ram cylinder device are connected by piping, there is no deceleration position adjustment device on the other cylinder side. Not necessary. In this way, the stroke of the pull back ram 23 can be adjusted by simply adjusting the deceleration position adjusting device at one location. or,
The stroke can be adjusted by simply raising and lowering the adjustment rod 36, and there is no need to make large adjustments to the pullback ram 23 itself depending on the thickness of the mold, unlike in the past, and the amount of upward protrusion of the pullback ram 23 can be reduced. The overall size can be reduced.

In addition, it is safer because the operator does not have to climb up to the top of the vertical molding machine to adjust the stroke as in conventional machines, and the work is simply by rotating the adjustment rod, so no large force is required. This makes the work easier.

As is clear from the above description, the present invention includes a deceleration position adjustment device that can adjust the stroke of the pullback ram simply by rotating the adjustment rod, so it is not necessary to rotate the pullback ram to raise and lower the pullback ram. The height of the molding machine can be lowered, and it can be easily adjusted with a small amount of force.

Note that if two or more pullback cylinders are connected via piping, the stroke can be adjusted by adjusting only one location.

[Brief explanation of the drawing]

1 and 2 are a vertical cross-sectional view of a vertical molding machine showing a conventional structure, and an enlarged vertical cross-sectional view of a bulbuck ram cylinder device,
FIG. 3 is a longitudinal sectional view of a bulbuck ram cylinder device section showing one embodiment of the present invention. 1...Fixed plate, 2...Fixed mold, 3...
・Cylinder platen 7...Movable plate, 8...Movable mold, 10...Bulbacram cylinder device, 11.
...Pullback cylinder, 11a... Throttle section, 2
3... Purbatukulam, 24... Ramrod, 26...
Deceleration position adjustment device, 27-34... Deceleration boat also 36... Adjustment rod, 38... Annular groove, 39...
...Hole ~ 40...Through hole, 41...Hiroyu mouth. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A throttle section with an inner diameter slightly larger than the outer diameter of the pull back clam is provided in the front part of the pull back cylinder of the pull back clam cylinder device, and a plurality of deceleration ports are arranged in this throttle section in the axial direction of the pull back cylinder, And a molding machine having a pull-button cylinder device equipped with a deceleration position adjustment device between the deceleration port portion and the oil drain port, the position of which is adjustable to adjust the communication state of hydraulic oil. .