JPH0518108Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a table drive device for an injection molding machine for synthetic resin materials, and in particular, it uses the vertical movement of the main table to move the slide table in the horizontal direction. This invention relates to a table drive device that moves the table forward and backward.

[Conventional technology]

Generally, as a table drive device in an injection molding machine for synthetic resin materials, a slide table that moves horizontally is provided above a main table that fixes the upper mold and moves up and down to open and close the mold. There is one with a lower mold placed on it. The removal of the molded product and the insertion of insert parts are performed with the slide table being moved back and protruding from the frame.

The table driving device of such an injection molding machine includes two hydraulic systems: a hydraulic system for moving the main table up and down, and a hydraulic system for moving the slide table forward and backward.

[Problem that the invention attempts to solve]

Since the conventional drive device described above includes two hydraulic systems, one for driving the main table and one for driving the slide table, the entire injection molding machine becomes large and complicated. In addition, manufacturing costs increase due to the large number of parts and equipment such as cylinders and control valves, and since the operations of each table must be controlled in conjunction with each other, a control device is required, further increasing costs. It will rise.

Therefore, the object of this invention is to provide a table driving device that can reliably control the driving of the main table and slide table using a single hydraulic system, and that also has a simple structure and does not increase the size of the injection molding machine. It is an object.

[Means for solving problems]

In order to achieve the above object, the table drive device according to this invention is used in an injection molding machine that molds synthetic resin material etc. by vertically moving the movable mold in cooperation with a fixed mold. a slide table that is attached and is slidable in a direction intersecting the direction of the vertical movement; a main table to which the slide table is slidably attached and that moves up and down to close the mold; and one end of the slide table a first traction means, which is guided by a force deflection means and whose other end is fixed to a first shock absorber provided in the mold opening direction of the main table; a second traction means fixed to the rear end of the slide table, guided by the force deflection means, and the other end fixed to a second shock absorbing device provided in the mold clamping direction of the main table; The present invention is characterized in that when the main table moves in the mold-clamping direction, the slide table is moved forward from the outside of the frame to the mold-clamping position by the first traction means.

Note that the front and rear ends of the slide table are forward when the slide table slides to the mold clamping position, and the front side of the forward movement is the front end, and the side after the forward movement is the rear end.

[Effect]

For example, in a lower mold drive type injection molding machine in which the fixed mold is an upper mold and is disposed on the upper part of the frame, and the movable mold is a lower mold and the slide table is installed on the main table, When the main table rises during mold clamping, the first traction means pulls the tip of the slide table, so that the slide table moves forward to the mold clamping position. Note that a stopper is provided at an appropriate position to restrict the forward movement of the slide table. Since the main table is raised, the synthetic resin material is molded using the movable mold and the fixed mold. When the main table descends to open the mold, the second traction means pulls the rear end of the slide table, causing the slide table to move back and protrude outside the frame to facilitate the removal of molded products and the insertion of insert parts. I can do it.

〔Example〕

The table driving device for an injection molding machine according to this invention will be explained in detail below based on the preferred embodiment shown in FIGS. 1 to 4.

FIG. 1 is a side view of an injection molding machine in an open mold state, in which a main cylinder 2 is provided on a bed 1. An appropriate number of posts 3 are provided on the flange 2a of the main cylinder 2 in an upright manner. A main table 4 is loosely fitted onto this post 3, and the lower surface of this main table 4 is connected to the piston rod 2b of the main cylinder 2.
When the piston rod 2b operates, the main table 4 is guided by the post 3 and moves up and down. In addition, the flange 2a of the main cylinder 2
A booster cylinder 5 is attached to the booster cylinder 5, and the lower surface of the main table 4 is also connected to its piston rod 5a, and the main table 4 also moves up and down by the operation of the piston rod 5a. Note that the booster cylinder 5 and the main cylinder 2
The relationship is that the main cylinder 2 is raised to the mold clamping end position by the booster cylinder 5, and then the main cylinder 2 is operated to further raise the main table 4, and the lower mold, which will be described later, is held at the mold clamping position. Bring it into close contact with the upper mold described later.

On the other hand, an upper mold plate 20 is fixed to the upper end of the post 3, and an upper mold 21 as a fixed mold is attached to the lower surface of this upper mold plate 20. The post 3 is fixed to the flange 2a of the main cylinder 2 by tightening the nut 22, and the upper mold plate 20 is fixed to the post 3 by tightening the nut 23.

A plate 6 is attached to the upper surface of the main table 4, and two guide bars 7 are arranged in parallel on the upper surface of the plate 6. In the figure, reference numeral 8 denotes a slide table, in which a guide holder 8a provided on the lower surface of the slide table 8 and the guide bar 7 are engaged with each other via a linear bearing, etc., so that the slide table 8 is guided by the guide bar 7 and It is slidable in a direction intersecting the operating direction of the main table 4, that is, in a horizontal direction. The case where the slide table 8 slides in the right direction in FIG. 1 is defined as forward movement, and the case where it slides in the opposite direction is defined as backward movement. FIG. 1 shows a state in which the slide table 8 is retracted to the rearmost position, and in this case, as shown in the figure, it is designed to protrude outside the frame constituted by the posts 3.

One end of a forward chain 9 serving as a first traction means is fixed to the forward end portion 8b of the slide table 8 in the forward direction. Further, a chain sprocket 9a serving as force deflection means is supported at the front end of the plate 6 so as to be rotatable about the horizontal direction, and the forward chain 9 engages with the chain sprocket 9a. are doing. The forward chain 9 is stretched as shown by the dashed line in FIG. 1, and the other end of the forward chain 9 is attached to the first
Piston 10a of cylinder 10 as a shock absorber
It is attached to. A push spring 10b is fitted in the cylinder 10, and the restoring force of the push spring 10b is biased so that the piston 10a always moves downward, that is, always applies tension to the forward chain 9. It has been done.

In addition, the rear end 8c of the slide table 8 has
One end of a retraction chain 11 serving as a second traction means is fixed. At the rear end of the plate 6, a rear chain sprocket 11a as a force deflection means is installed, and at the tip of the plate 6, a similar front chain sprocket 11b (shown in the fourth figure) is installed in the horizontal direction. The retraction chain 11 is engaged with the rear chain sprocket 11a and the front chain sprocket 11b. The retraction chain 11 is stretched as shown by the two-dot chain line in FIG. It is fixed to a stop bar 12 as a shock absorber. Further, a restoring force such as a spring (not shown) is applied to the stop bar 12 so that the stop bar 12 always moves upward, that is, so as to always apply tension to the retraction chain 11.

A lower mold 13 as a movable mold is attached to the upper surface of the slide table 8.

Further, a stop bolt 14 (shown in the fourth figure) for stopping the advance of the slide table 8 when it advances to the mold clamping position is provided with its tip (not shown) protruding into the sliding area of the slide table 8. It is provided on the plate 6 as shown in FIG.

Note that a push cylinder 15 is attached to the main cylinder 2, and its piston rod 15
a passes through the plate 6, and the push cylinder 15
The piston rod 15a is caused to protrude above the slide table 8 and the lower mold 13 by the operation of the piston rod 15a.

The operation of the embodiment of the table driving device configured as described above will be described below.

FIG. 1 is a side view of the mold in an open state, and in this state, an operator performs preparation work for placing insert parts and the like on the lower mold 13.

When the preparation work is completed, the booster cylinder 5 is operated to raise its piston rod 5a. This causes the main table 4 to rise. Since the lower end of the forward chain 9 is fixed to the cylinder 10, the distance from the cylinder 10 to the chain sprocket 9a increases as the main table 4 rises. Since the overall length of the forward chain 9 is constant, the distance from the chain sprocket 9a to the slide table 8 must be shortened, so that the slide table 8 is guided by the guide bar 7 and moves forward in the right direction in FIG. I will do it. When the slide table 8 advances to an appropriate position due to the rise of the booster cylinder 5, it comes into contact with the tip of the stop bolt 14, and the second
Advancement is blocked at the position shown in the figure. As shown in the figure, the lower mold 13 and the upper mold 21 are still in an open state at this time, and the lower mold 13 and the upper mold 21 are opened at the position of the slide table 8 that is prevented from moving forward. A provided positioning pin (not shown) can fit into the positioning boss. Also, almost at the same time that the slide table 8 comes into contact with the stop bolt 14, the upper end surface of the plate 6 is brought into contact with the stop bar 1.
It comes into contact with the lower end surface of 2.

On the other hand, as the slide table 8 moves forward, the retracting chain 11 moves toward the rear chain sprocket 1.
1a, and as shown in FIG. 2, the length from the rear chain sprocket 11a to the slide table 8 becomes longer.

When the slide table 8 stops moving forward, the main cylinder 2 starts operating and moves the main table 4.
further increase. In this case, as the main table 4 rises, the slide table 8 only rises without moving forward, and at this time, as shown in FIG. 3, the driving force of the main cylinder 2 resists the restoring force of the push spring 10b. The piston 10b is raised and the lower end of the forward chain 9 is pulled up.
On the other hand, as shown in the figure, the stop bar 12 is pushed upward. And main cylinder 2
As a result, the positioning pin (not shown) and the positioning boss fit together, and the lower mold 13 is pressed against the upper mold 21 and comes into close contact with the upper mold 21, resulting in a mold clamping state, and the synthetic resin material is fed into these molds to form parts, etc. The molding is performed.

When the molding is completed, the pressure in the main cylinder 2 is released to open the mold, and the main table 4 is lowered by the piston rod 5a of the booster cylinder 5. As a result, the stop bar 12 is lowered and the piston 10a of the cylinder 10 is raised. When the stop bar 12 is lowered to the lowest end and the piston rod 5a of the booster cylinder 5 is further lowered, the retracting chain 11 pulls back the slide table 8, so that the slide table 8 is retracted. Further, the forward chain 9 is pulled back by the retreat of the slide table 8, and the chain sprocket 9a is removed from the slide table 8 of the forward chain 9.
The length of the part up to this point becomes longer, and the state shown in FIG. 1 is restored.

Then, slide table 8 is placed outside the frame.
is positioned, the push cylinder 15 operates and its piston rod 15a rises, and the lower mold 1
The molded product in the mold 3 is pushed up and removed from the lower mold 13. The operator removes this molded product and performs preparation work for the next molding.

In this embodiment, a forward chain 9 is used as the traction means.
and a retraction chain 11 are shown,
Other means such as a wire rope or a flat belt may also be used. In addition, chain sprocket 9
A rope sheave or belt pulley will be used instead of a, 11a, and 11b.

Further, as a shock absorbing device, the first shock absorbing device is a combination of a cylinder 10 and a push spring 10b, and the second shock absorbing device is a stop bar 12, but other means such as a reciprocating cylinder using hydraulic pressure are shown. It is also possible to use something that provides a buffer.

[Effect of idea]

As explained above, according to the table drive device for an injection molding machine according to this invention, since the slide table is advanced and retreated in conjunction with the vertical movement of the main table using the traction means, the hydraulic pressure for driving the main cylinder is There is no need to provide a hydraulic device for driving the slide table in addition to the device. Therefore, there is no need to increase the size of the injection molding machine.
It doesn't have to be complicated either. Moreover, since the slide table can be reliably moved forward and backward in conjunction with the vertical movement of the main table, there is no need for a complicated control device, and only parts such as a chain and chain sprocket are provided, making the structure simple. It is possible to reduce manufacturing costs.

In addition, insert parts can be inserted and molded products can be taken out with the slide table protruding outside the frame, that is, with the top of the slide table open, improving work efficiency.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the table drive device for an injection molding machine according to the present invention, and FIG. 1 is a side view of the table drive device for an injection molding machine in a state where the mold is opened and preparation work is being performed. FIG. 2 is a side view of the slide table moved to the frontmost position due to the rise of the main table, with some parts omitted. FIG. 3 is a partially omitted side view of the mold in the clamped state. FIG. 4 is a rear view of the mold clamped state, with some parts omitted. 2... Main cylinder, 2a... Flange, 2
b... Piston rod, 3... Post, 4... Main table, 5... Booster cylinder, 7...
Guide bar, 8...Slide table, 8b...
Tip part, 8c...Rear end part, 9...Advance chain (first traction means), 9a...Chain sprocket (force deflection means), 10...Cylinder, 10b...
Push spring (first shock absorber), 11... Retraction chain, 11a... Rear chain sprocket (force deflection means), 11b... Front chain sprocket (force deflection means), 12... Stop bar (second shock absorber), 13...lower mold, 20...upper mold plate,
21... Upper mold.

Claims (1)

[Scope of Claim for Utility Model Registration] In an injection molding machine that molds a synthetic resin material, etc. by vertical movement of a movable mold in cooperation with a fixed mold, the movable mold is attached and the direction of the vertical movement is a slide table that is slidable in intersecting directions; a main table that is slidably attached to the slide table and that moves up and down to clamp the mold;
A first traction whose one end is fixed to the tip of the slide table, guided by a force deflection means, and whose other end is fixed to a first shock absorber provided in the mold opening direction of the main table. means, one end fixed to the rear end of the slide table, guided by the force deflection means, and the other end fixed to a second shock absorbing device provided in the mold clamping direction of the main table. a second traction means, and when the main table moves in the mold-clamping direction, the slide table is moved forward from the outside of the frame to the mold-clamping position by the first traction means. Drive device.