JPS6142812Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a mold fixing device for injection molding machines, press machines, die casting machines, etc., which fixes the mold to a fixed or movable surface plate. .

Conventionally, attaching a mold to a surface plate of an injection molding machine or the like has normally been done by manually tightening four to eight bolts.

This process usually takes 30 minutes, or 1 minute for large molds.
This took more time than usual, and this was one of the major factors hindering productivity improvement.

This mold mounting work is heavy work, very painful for the workers, and is also accompanied by danger.

In contrast, in recent years, the first mold fixing device has been
As shown in Figures 3 to 15, the wedge 12 is actuated using the fluid pressure P, and the wedge action tightens the mold mounting plate 5 of the mold 3 to the surface plate 1, thereby fixing the mold 3. something is being developed.

However, this fixing device using the wedge 12 has problems such as the wedge 12 being difficult to remove when the wedge 12 is released, the tip of the wedge 12 being worn out, and the mold mounting plate 5 needing to be standardized.

The present invention solves these problems, allows the mold to be reliably tightened and released, and can be made compact as a whole.

This will be explained with reference to the diagram.

1 and 1 are opposing surface plates in an injection molding machine, one surface plate 1 being fixed and the other surface plate 1 being movable. Reference numerals 3 and 3 designate molds that are attached to the surface plates 1 and 1, respectively, and 5 designates a mold mounting plate for the molds.

The mold fixing device of the present invention will be explained with reference to FIGS. 3 to 8.

6 is a cylinder, 7 is a cylinder head, and 8 is a cylinder cover, and these three are integrated. The cylinder head 7 is fixed to the surface plate 1 with bolts 20 (see FIGS. 3 and 4).

A second cylinder 32 is formed on the inner surface of the cylinder cover 8, and the second cylinder 32 has a piston 1.
0 is inserted.

16 is a through hole communicating with the second cylinder 32, and guides fluid pressure from an appropriate fluid pressure source to the second cylinder 32.

31 is a piston rod of the piston 10, and its tip fixes the wedge 12 slidably fitted in the guide cylinder 11 with a screw 30.

The guide cylinder 11 is movably fitted within the cylinder head 7.

Reference numeral 9 denotes a piston plate provided within the cylinder 6. The piston plate 9 is fitted onto the piston rod 31 and can be moved left and right between the piston 10 and the guide cylinder 11 along the piston rod 31.

That is, by introducing fluid pressure into the cylinder 6 through the through hole 17 provided in the cylinder cover 8, the piston plate 9 moves forward (rightward), and the fluid pressure is introduced into the cylinder through the through hole 18 provided in the cylinder head 7. If it is introduced into 6, it will move backwards (to the left).

As mentioned above, the guide cylinder 11 is slidably fitted in the cylinder head 7, but its advancement is carried out by being pushed by the piston plate 9 as it moves forward, and reaching its ultimate limit. is until the flange 34 of the guide cylinder 11 abuts against the step 7' of the cylinder head 7. At this time, the tip of the guide cylinder 11 protrudes from the cylinder head 7, as shown in FIG.

As described above, when the piston plate 9 retreats and collides with the piston 10 to cause it to retreat, the wedge 12 integrated with the piston rod 31 collides with the bottom wall 33 of the guide cylinder 11. From this point on, the cylinder 11 is also moved back as the piston 10 moves back.

A guide groove 29 is bored below the end of the guide cylinder 11, and a tightening block 13 is provided therein so as to be movable up and down.

Reference numeral 14 denotes a bolt screwed onto the wall of the guide cylinder 11, the head of which is inserted into a groove 13' formed in the tightening block 13 via a spring 15.

The tip of the wedge 12 has two forks 12', 12' (see Fig. 5), and when the wedge 12 moves forward, the two forks 1
2', 12', the bolt 14 is inserted without hindering its advancement, and as a result of its advancement, the inclined wedge surface 35 presses the tightening block 13 downward.

21 is a dust seal, 22, 23, 24, 2
5, 26, 27, 28 are O-rings.

The action and effect will be explained.

To use this device, first fix the cylinder head 7 to the surface plate 1 with bolts 20.

At this time, the piston 10 and the piston plate 9
is in the most retracted position, as shown in Figure 7,
The wedge 12 abuts against the bottom wall 33 of the guide cylinder 11, and the guide cylinder 11 is also in its most retracted position, with its tip either on the same level as the end surface of the cylinder head 7 or at a slightly retracted position. .

Here, the mold 3 is carried onto the surface plate 1.

When fluid pressure is introduced into the cylinder 6 through the through hole 17, the piston plate 9 moves forward and collides with the guide cylinder 11, causing it to move further forward.

As the guide cylinder 11 moves forward, the wedge 12, the piston rod 31 screwed onto the wedge 12, and the piston 10 also move.

In this case, a force in the backward direction acts on the piston 10 due to fluid pressure, but this force is smaller than the force acting on the piston plate 9, so while the guide cylinder 11 is moved forward by the piston plate 9, 12 necessarily moves in a state in which it is in contact with the bottom wall 33 of the guide cylinder 11.

At this time, the tightening block 13 is still being pushed upward by the force of the spring 15.

In this state, the guide cylinder 11 continues to move forward until the flange 34 of the cylinder abuts against the step 7' of the cylinder head 7, resulting in the state shown in FIG. The tightening block 13 is located on the mold mounting plate 5 of the mold 3.

Next, when fluid pressure is introduced into the second cylinder 32 through the through hole 16, the piston 10 moves forward, whereby the wedge 12 is guided by the guide cylinder 11 and moves forward.

As the wedge 12 moves forward, its inclined wedge surface 35 presses the tightening block 13 downward against the spring 15.

Due to the lower pressure of this wedge 12, the tightening block 13
is guided by the guide groove 29 of the guide cylinder 11, and the block 13 is guided by the mold mounting plate 5 of the mold 3.
The forward movement of the piston 10, which is in contact with
The mold mounting plate 5 is tightened by the wedge action caused by the mutual friction between the mold mounting plate 5 and the mold mounting plate 5 to complete its fixation. This situation is shown in FIG.

In addition, when the wedge 12 moves forward in lowering pressure on the tightening block 13, the two forks 1 at the tip of the wedge 12 move forward.
Since the parts 2' and 12' pass through the bolt 14 while crossing it, the bolt 14 does not hinder its advancement.

Next, in order to release the clamping of the mold and remove it, fluid pressure is introduced through the through hole 18 of the cylinder head 7, and the piston plate 9 is moved back.

After the piston plate 9 has retreated a certain distance, it comes into contact with the piston 10. (When tightening the mold,
(The length of the piston rod 31 is determined in advance so that the piston 10 does not collide with the piston plate 9.) Then, the piston 10 retreats together with the piston plate 9.

In this case, since the guide cylinder 11 is pressed in the forward direction by the fluid pressure, it remains at its initial position and does not move together with it.

As the piston 10 retreats, the mold clamping due to the wedge action between the wedge 12 and the clamping block 13 is released.
The tightening block 13 is moved upward by the force of the spring 15 and drawn into the guide groove 29.

The wedge 12 is further retreated and comes into contact with the bottom wall 33 of the guide cylinder 11.

As the piston plate 9 continues to move backward, the guide cylinder 11 moves backward, and the movement of the piston plate 9 into the cylinder cover 8 causes the guide cylinder 11 to move backward.
It continues until it comes into contact with. As a result, the guide cylinder 11 is completely retracted into the cylinder head 7, returning to the state shown in FIG.

At this point, the mold 3 may be transported out.

9 to 12 show one embodiment of the fluid pressure circuit for the fluid pressure operation, and FIG. 9 shows a state in which fluid pressure is introduced into the through hole 17 to advance the piston plate 9. shows.

FIG. 10 shows that the piston plate 9 subsequently comes into contact with the guide cylinder 11 and moves it further forward, thus completing the advance of the guide cylinder 11. FIG. 11 shows a state in which the mold is tightened by introducing fluid pressure into the through hole 16 to move the wedge 12 forward. FIG. 12 shows a state in which fluid pressure is introduced into the through hole 18 to prevent the mold clamping from being released.

According to the present invention, the mold can be fixed to the surface plate by tightening the mold using fluid pressure, so the fixing operation is extremely simple, and it is possible to save labor and improve productivity.

Tightening with a wedge is performed via a tightening block, so there is no need to standardize the thickness of the mold mounting plate as in the past, and even if the wedge becomes worn, this tightening block can be used. You only need to replace it. In addition, when releasing the tightening force,
The fluid pressure receiving area can be made larger than when tightening, and dynamic force can be applied directly to the wedge when releasing, so the wedge can be pulled out reliably.

When attaching and detaching the mold, by providing two cylinders, one for moving the guide cylinder and the other for moving the wedge, and making this a double-acting type, the whole can be made compact and its operation is reliable. It is.

[Brief explanation of drawings]

Fig. 1 is a side view of the injection molding machine with the mold attached, Fig. 2 is a longitudinal sectional side view of the device of the present invention when it is tightened, Fig. 3 is its front view, and Fig. 4 is its plan view.
Figure 5 is a side view of the device, Figure 6 is a vertical side view when the tightening is released, Figure 7 is a vertical side view when the mold is installed or removed, and Figure 8 is the device placed on a surface plate. The plan view and FIGS. 9 to 12 are fluid pressure circuit diagrams of the present device, in which FIG. 9 shows the piston plate when attempting to move forward, and FIG. 10 shows the state in which the guide cylinder is moved forward. , FIG. 11 shows a state in which the piston is moved forward and the mold is clamped by a wedge, and FIG. 12 shows a state in which the clamping is about to be released. FIG. 13 is a plan view of the conventional device, FIG. 14 is a vertical cross-sectional side view of the fluid pressure operating portion taken along the line A-A, and FIG. 15 is a vertical cross-sectional side view of the wedge portion taken along the line B-B. 6...Cylinder, 7...Cylinder head, 8...
...Cylinder cover, 9...Piston plate, 1
0... Piston, 11... Guide cylinder, 12
... Wedge, 31 ... Piston rod, 32 ... Second
Cylinder, 35... Inclined wedge surface.

Claims (1)

[Scope of utility model registration request] A cylinder cover 8, a cylinder 6, and a cylinder head 7 are provided integrally, a guide cylinder 11 is movably fitted in the cylinder head 7, and a piston rod of a piston 10 is fitted into a second cylinder 32 provided on the cylinder cover 8. At the tip of 31,
A wedge 12 slidably provided within the guide cylinder 11
is fixed, and the cylinder 6 is fixed to the piston rod 31.
An injection molding machine, etc., in which a piston plate 9 movable inside is fitted, and a guide cylinder 11 is provided with a tightening block 13 which abuts against the inclined wedge surface 35 of the wedge 12 and is slidable up and down. mold fixing device.