Abstract
A device includes a sliding base, supporting posts, and hydraulic
oil; the sliding base has cavities, an oil passage communicating with
the cavities, and oil seals secured around respective cavities, and
it is movable along a guide rail secured on a bed of an injection
molding machine; the supporting posts each have a room on a lower
end, and are inserted in respective cavities such that the rooms communicate
with the cavities; the posts touch and prop a movable wall of the
molding machine at upper ends, which wall is supported by and movable
along guide rods, and has bushings around the guide rods; the hydraulic
oil is injected into the sliding base and the posts until the axes
of each bushing and the corresponding guide rod are aligned; thus,
alignment of the axes of each bushing and the corresponding guide
rod will be maintained when the movable wall is moving.
Claims
1. An adjustment device for a movable wall of an injection molding
machine, comprising a sliding base; the sliding base being formed
with a plurality of cavities on an upper side thereof; the sliding
base being formed with an oil passage communicating with the cavities;
the sliding base having oil seals secured around respective ones of
the cavities thereof; the sliding base being supported on and movable
along a guide rail secured on a bed of an injection molding machine;
a plurality of supporting posts; each of the supporting posts having
a holding room on a lower end thereof; the supporting posts being
inserted in respective ones of the cavities of the sliding base such
that the holding rooms communicate with the cavities; the supporting
posts touching a bottom of a movable wall of the injection molding
machine at upper ends thereof so as to prop the movable wall; the
movable wall being supported by and movable along plural guide rods
of the injection molding machine; the movable wall having bushings,
which are around respective ones of the guide rods; and hydraulic
oil; the hydraulic oil being injected into the sliding base and the
holding rooms of the supporting posts through the oil passage until
axes of each bushing and a corresponding guide rod are aligned with
each other, with upper end portions of the holding rooms of the supporting
posts becoming air-containing rooms full of air; whereby alignment
of the axes of each bushing and the corresponding guide rod will be
maintained when the movable wall is moving as well as when the movable
wall is still.
2. The adjustment device for a movable wall of an injection molding
machine as claimed in claim 1 being further equipped with pistons,
which are held in respective ones of the holding rooms of the supporting
posts so as to closely touch inner sides of the supporting posts,
such that air will be contained and uniformly distributed in space
between the pistons and upper ends of the holding rooms of the supporting
posts to increase smoothness of movement of the movable wall.
3. The adjustment device for a movable wall of an injection molding
machine as claimed in claim 1, wherein the sliding base is formed
with a hole, which communicates with the oil passage, and which
has female screw threads in an upper section thereof while a rod
part, which has male screw threads on an upper section thereof,
is passed through and threadedly engaged with the hole of the sliding
base; thus, hydraulic pressure in the adjustment device can be adjusted
by means of displacing the rod part in relation to the hole of the
sliding base.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the invention
[0002] The present invention relates to an adjustment device for
a movable wall of an injection molding machine, more particularly
one, which will help lengthen the service life of the injection
molding machine.
[0003] 2. Brief Description of the Prior Art
[0004] Referring to FIG. 1, a conventional plastic injection molding
machine 1 includes a bed 11, a heating device 12, a mold 13, a movable
wall 14, a fixed wall 15, a rear seat 16, a mold closing device
17, and four guide rods 18. The guide rods 18 are secured to the
rear seat 16 at first ends thereof, and securely joined to the fixed
wall 15 at the other ends thereof. The movable wall 14 is supported
on and movable along the guide rods 18. The mold 13 includes male
female halves, which are secured on the movable wall 14, and the
fixed wall 15 respectively. The heating device 12 is positioned
on the bed 11 for melting plastic materials, and injecting the materials
into the mold 13. The mold closing device 17 is connected to both
the rear seat 16 and the movable wall 14 for moving the movable
wall 14 along the guide rods 18, and it can be equipped with oil
hydraulic cylinders or toggles.
[0005] Furthermore, the movable wall 14 is equipped with bushings
141 around the guide rods 18. Because the intermediate portions
of the guide rods 18, along which the movable wall 14 will move,
aren't propped with other articles, and the mold closing device
17, the movable wall 14, and the male (female) halves of the mold
13 together are very heavy in weight, axes of the guide rods 18
and bushings 141 of the movable wall 14, through which the guide
rods 18 are passed, will change their direction, causing the orientation
of the guide rods 18 in relation to the bushings 141 to undesirably
change as shown in FIG. 2. Consequently, the bushings 141 will touch
the guide rods 18 in an abnormal way, and wear down too rapidly.
[0006] Referring to FIG. 3, to overcome the above problem, adjustment
devices 19 are connected to two ends of a bottom of the movable
wall 14. The adjustment devices 19 are movable along guide rails
111 secured on the upper side of the bed 11, and each includes a
fixed sloping block 191, a movable sloping block 192, and a bolt
193; the movable sloping block 192 is on the guide rails 111 with
a sloping side thereof facing up while the fixed sloping block 191
has a sloping bottom touching the upper sloping side of the movable
sloping block 192; the bolt 193 is connected to both the movable
sloping block 192 and the fixed sloping block 191, used for changing
position of the movable sloping block 192 relative to the fixed
sloping block 191. Therefore, the two ends of the movable wall 14
can be adjusted in height, and the movable wall 14 will be propped
up by means of the adjustment devices 19, maintaining the original
direction of the axes of the guide rods 18 and the bushings 141
of the movable wall 14, and preventing the bushings 141 from touching
the guide rods 18 in an abnormal manner to wear down too rapidly.
Consequently, the bushings 141 have longer service life.
[0007] However, the bushings 141 will be prevented from touching
the guide rods 18 to wear down in an abnormal manner only when the
movable wall 14 is still. When the movable wall 14 is moving along
the guide rods 18, it will still move up and down because the guide
rails 111 aren't one hundred percent smooth owing to limitation
on precision of manufacturing. Consequently, the axes of the guide
rods 18 and the bushings 141 of the movable wall 14 will change
their direction, and the bushings 141 will touch the guide rods
18 in an abnormal manner, and wear down too rapidly.
SUMMARY OF THE INVENTION
[0008] It is a main object of the invention to provide an improvement
on adjustment device for a movable wall of an injection molding
machine to overcome the above-mentioned problem. The adjustment
device includes a sliding base, supporting posts, and hydraulic
oil. The sliding base has cavities, an oil passage communicating
with the cavities, and oil seals secured around respective ones
of the cavities, and it is movable along a guide rail secured on
a bed of an injection molding machine. The supporting posts each
have a holding room on a lower end, and they are inserted in the
cavities of the sliding base such that the holding rooms communicate
with the cavities. The supporting posts touch and prop a movable
wall of the molding machine at upper ends, which wall is supported
with and movable along guide rods, and has bushings around the guide
rods. The hydraulic oil is injected into the sliding base and the
supporting posts through the oil passage until the axes of each
bushing and the corresponding guide rod are aligned with each other,
with upper end portions of the holding rooms of the supporting posts
containing air therein. Therefore, alignment of the axes of each
bushing and the corresponding guide rod will be maintained when
the movable wall is moving as well as when the movable wall is still.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The present invention will be better understood by referring
to the accompanying drawings, wherein:
[0010] FIG. 1 is a front view of the conventional molding machine,
[0011] FIG. 2 is a view showing the relation between the guide
rod and the bushing of the movable wall of the conventional molding
machine,
[0012] FIG. 3 is a sectional view of the conventional adjustment
device,
[0013] FIG. 4 is an exploded perspective view of the adjustment
device according to the present invention,
[0014] FIG. 5 is a horizontal sectional view of the present invention,
[0015] FIG. 6 is a lateral sectional view of the present invention,
[0016] FIG. 7 is a view showing the condition of the adjustment
device of the present invention is use (1),
[0017] FIG. 8, is a view showing the condition of the adjustment
device of the present invention is use (2),
[0018] FIG. 9 is a view showing the condition of the adjustment
device of the present invention is use (3),
[0019] FIG. 10 is a section of the second preferred embodiment,
and
[0020] FIG. 11 is a section of the third preferred embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0021] Referring to FIGS. 4 to 6, a first preferred embodiment
of an adjustment device 2 for a movable wall of an injection molding
machine is provided. The adjustment device 2 is connected to a bottom
of a movable wall 14 of the injection molding machine. The movable
wall 14 is supported by and movable along guide rods 18 of the molding
machine, and it has bushings 141 around the guide rods 18.
[0022] The adjustment device 2 includes a sliding base 21, several
supporting posts 22, and oil seals 23. The sliding base 21 is formed
with several cavities 211 on an upper side thereof, and an oil passage
212, which communicates with the cavities 211. The oil seals 23
are secured around respective ones of upper ends of the cavities
211 of the sliding base 21. Each of the supporting posts 22 has
a holding room 221 on a lower end thereof. The supporting posts
22 are inserted in respective ones of the cavities 211 of the sliding
base 21. The adjustment device 2 is positioned between both the
movable wall 14 and a bed 11 of the molding machine with the sliding
base 21 being supported on and movable along a guide rail 111 secured
on the bed 11, and with the supporting posts 22 being connected
to the bottom of the movable wall 14; therefore, the adjustment
device 2 and the movable wall 14 will move along the guide rail
111 in the same direction and speed. And, hydraulic oil is injected
into the sliding base 21 through the oil passage 212 until the supporting
posts 22 prop up the movable wall 14 such that the axes of each
bushing 141 and the corresponding guide rod 18 are completely aligned
with each other; upper end portions of the holding rooms 221 of
the supporting posts 22 will become air-containing rooms 222, which
are full of air.
[0023] Therefore, when the sliding base 21 of the adjustment device
2 is moving on unsmooth portions of the guide rail 111 of the bed
11 during the course of to-and-fro movement of the movable wall
14, the adjustment device 2 will prevent possible vibration thereof
from being passed on to the movable wall 2, with air being further
compressed in the air-containing rooms 222 of the supporting posts
22. Consequently, the movable wall 14 is prevented from moving up
and down, and the alignment of the axes of each bushing 141 and
the corresponding guide rod 18 is maintained.
[0024] Referring to FIG. 10, the adjustment device 2 is further
equipped with pistons 24, which are held in respective ones of the
holding rooms 221 so as to closely touch the inner sides of the
supporting posts 22. Therefore, when hydraulic oil is injected into
the sliding base 21 as well as the supporting posts 22 through the
oil passage 212, the pistons 24 will be pushed upwards along the
holding rooms 221, causing compression of air contained in the space
between the pistons 24 and the upper ends of the holding rooms 221
of the supporting posts 22. And, air will be uniformly distributed
in the upper end portions of the holding rooms 221 because the pistons
24 and the supporting posts 22 are solid. Consequently, the movable
wall 14 will move along the guide rods 18 even more smoothly.
[0025] Referring to FIG. 11, the sliding base 21 is further formed
with a hole 213, which communicates with the oil passage 212, and
has female screw threads 2131 in an upper section thereof. And,
a rod part 214, which has male screw threads 2141 on an upper section
thereof, is passed through and threadedly engaged with the hole
213 of the sliding base 21. Therefore, when the hydraulic pressure
in the adjustment device 2 becomes insufficient after the adjustment
device 2 has been used for a long time, the user is allowed to increase
the hydraulic pressure by means of displacing the rod part 214 in
relation to the hole 213 of the sliding base 21 so as to pressurize
the hydraulic oil.
[0026] From the above description, it can be easily seen that the
adjustment device of the present invention has an advantage over
the conventional one because it will maintain the alignment of the
axes of each bushing of the movable wall and the corresponding guide
rod not only when the movable wall is still, but also when the sliding
base is moving on unsmooth portions of the guide rail of the bed
during the course of to-and-fro movement of the movable wall, thus
preventing the bushings from touching the guide rods in an abnormal
manner to wear down too rapidly. |