JPH0216832Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a mold clamping device for a casting machine, and aims to provide a technology that greatly contributes to its automation.

(Prior art) Conventionally, clamping for the bolster of a mold for a casting machine is roughly divided into a manual tightening method using a matsuba and an automatic method using a drive source such as a hydraulic cylinder. Although it is possible to achieve a reliable clamping state and unclamping state and to ensure system integrity, on the other hand, there is a limit to the operating rate and workability.
In general, it has become common to introduce the latter automatic method.

By the way, this conventional automatic method uses a clamp claw based on the lever principle, and this clamp claw is rotationally driven by a drive source to perform both clamping and unclamping operations, and the drive source is driven. One type has a structure in which the force is directly used as a clamping force, and the other has a structure in which the driving force of a drive source is applied to the clamp claw through a power transmission boosting mechanism such as a wedge to perform clamping and unclamping operations. ,
A method is known in which the driving force of the driving source does not directly serve as the clamping force.

In the former method, the clamping claw is directly driven by the drive source, so reliable operation can be expected, but it is generally necessary to strengthen this in order to obtain a stable clamping force. In such cases, it is necessary to increase the size of the clamp claw or use a device with even greater driving force as a driving force, as the driving force becomes the clamping force. It is difficult to say that it is optimal in terms of equipment configuration,
In addition, if the drive source stops performing the specified operation due to a failure or other reason during clamping operation, the stable clamping condition will be destroyed, so system maintenance is not sufficient. .

On the other hand, the latter method has a configuration as shown in FIG. 1, for example. That is, in the same figure,
1 is a die base that constitutes a part of the body of the casting machine;
2 is a bolster integrally installed on the die base 1, 3 is a lower mold, and the lower mold 3 has a flange portion 3A formed in its lower part.

A clamp base 4 is further installed on the base 1 next to the bolster 2, and a hydraulic cylinder 5 serving as a driving source and a clamp holder 6 (not shown) are fixed to the clamp base 4. . A clamp claw 7 is housed in the clamp holder 6 and is held so as to be rotatable about a shaft 8.
The clamp claw 7 has one end serving as a clamp portion 7A that clamps the mold 3 by pressing the flange portion 3A of the mold 3 toward the bolster 2, and the other end receiving the driving force of the cylinder 5. This is called a power receiving section 7B. 5A is the piston rod of cylinder 5A, and this piston rod 5
At the tip of A is a wedge member 9 that serves as a power transmission member.
is fixed. The wedge member 9 is slidable on the clamp base 4 and is provided in contact with the lower surface of the clamp claw.
A biasing member 10 made of a spring or the like is provided at the upper part of the clamp holder 6, and the biasing member 10 always biases the clamp claw 7 to rotate in the clamp release direction.

In this configuration, when the wedge member 9 is driven forward in the direction of the arrow A, the movement in the A direction is converted to the movement in the direction of the arrow B by the intrusion of the clamp claw 7 below the power receiving part 7B, and the clamp part 7A is converted into a movement in the direction of the arrow B. The clamping operation is performed by being pressed against the flange portion 3A of the mold 3. That is, most of the reaction force due to the clamping force transmitted from the clamping part 7A and the power receiving part 7B is applied to the clamp base 4 via the wedge member 9, and is hardly applied toward the piston rod 5A, so that a stable clamping force can be obtained. It turns out.

However, during the clamp release operation, the wedge member 9 is driven backward in the direction of arrow A';
Since the power for rotating the clamp claw 7 in the direction of arrow B' relies on the urging force of the urging member 10,
If foreign matter enters the vicinity of the clamp claw 7, it may cause a failure in the clamp release operation. In particular, in rigid die-casting machines, since a horizontally split mold is used, the clamping device for the lower mold is placed on the side of the lower mold. The environment is extremely poor due to water splashing, etc., and as a result, clamp release operations fail during model changes, leading to a decrease in operating efficiency.

As described above, conventionally, various problems have arisen in automating the clamping device.

(Purpose of the invention) This invention was made in view of the above circumstances.
The aim is to provide a mold clamping device for a casting machine that is automated and advantageous.

(Structure of the invention) In order to achieve the above object, the present invention has the following structure.

That is, one end is a clamp part that clamps the mold to press it against the bolster, and the other end is
The intermediate portion of the clamp claw, which serves as a power receiving portion receiving the driving force from the driving means, is pivotally supported in the machine body, and a clamp base is installed below the power receiving portion, and the clamp base and the power receiving portion of the clamp claw are connected to each other. A wedge member is interposed between the wedge member and the wedge member is reciprocated to enable the clamp claw to rotate around its axis, and the power receiving portion of the clamp claw and the wedge member are each A connecting plate is provided to connect the power receiving part and the wedge member by providing a pin member, and a hole in the connecting plate that engages with one of the pins provided on the power receiving part and the wedge member is a long hole. , the long hole has a loose fit between the long hole and the pin when the wedge member moves in the clamping direction of the clamp claw, and the long hole and the pin engage with each other when the wedge member moves in the clamp release direction. This is a machine mold clamping device.

(Example) Hereinafter, the present invention will be explained in detail with reference to the embodiment shown in FIGS. 2 and 3. The same components as those shown in FIG. This will be omitted.

In FIGS. 2 and 3, 11 is a clamp claw according to the present invention, 11A is a clamp portion thereof,
11B is its power receiving section. A wedge member 12 serving as a power transmission member is fixed to the tip of the piston rod 5A of the cylinder 5.

The power receiving portion 11B of the clamp claw 11 is formed in a protruding upper portion, and a pin member 13 is provided thereon so as to protrude laterally. A pin member 14 is also provided on the wedge member 12 and protrudes in the same direction as the pin member 13. These pin members 13 and 14 include
Pin holes 15A and 15B formed at both ends of a connecting plate 15 serving as a connecting rod member are fitted, and the power receiving portion 11B of the clamp claw 11 and the wedge member 12 are connected by this connecting plate 15. ing. The pin hole 15A into which the pin member 13 for connecting the connecting plate 15 and the power receiving portion 11B is fitted is formed into a long hole.

In the above configuration, when the clamp is released as shown in FIG.
When pushed between the clamp claw 11 and the upper surface, the clamp claw 11 rotates in the direction of arrow B. Along with this rotation, the connecting plate 15 gradually stands up, and the pin member 13 located at one end of the pin hole 15A
It will gradually move toward the other end of the pin hole 15A. As the clamp claw 11 rotates in the B direction, the clamp portion 11A is attached to the flange 3 of the mold 3.
A, the connecting plate 15 stands approximately upright, the pin member 13 is located in the middle of the long hole 15A, and the third
A clamped state as shown in the figure is obtained. That is, the reaction force due to the clamping force is applied to the clamp base 4 via the wedge member 12 and absorbed by the clamp base 4, so that a stable clamping force can be obtained. Note that since the pin member 13 is located in the middle of the pin hole 15A, no reaction force due to the clamping force is applied from the pin member 13 to the connecting plate 15.

On the other hand, in the state shown in FIG. 3, when the wedge member 12 is retreated in the direction of arrow A', the connecting plate 15
With the inclination of the pin hole 1, the pin member 13 first
5A toward the end on the side far from the pin member 14. Further, when the wedge member 12 is moved backward, the pin member 13 comes into contact with the end of the pin hole 15A, and as a result, the clamp claw 11 is pulled by the connecting plate 15 in the direction of arrow B' (clamp release direction). I was forced to turn,
The clamp release operation will be performed reliably.

(Effect of the invention) As is clear from what has been described above, according to the present invention, the clamp claw does not become larger, and
Further, it is possible to stably obtain a clamping force without requiring an increase in the driving force of the driving source, and at the same time, it is possible to realize a reliable unclamped state. This eliminates the reduction in operating rate due to poor clamp release operation.

Further, since the clamp release operation is also performed by the drive source, it is possible to check the operation electrically, and there is an effect that maintainability in equipment management can be improved.

Furthermore, since the drive source for the clamp operation is also used for the clamp release operation, there is no need to provide a new drive source.

As described above, according to the present invention, which has various effects, it is possible to provide an automated and advantageous mold clamping device for a casting machine.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the structure of the conventional device, FIG. 2 is a front view showing the device of the present invention in the unclamped state,
FIG. 3 is a front view showing the clamped state. 1... Die base, 2... Bolster, 3... Lower die, 4... Clamp base, 5... Cylinder, 1
1...Clamp claw, 11A...Clamp part, 11
B... Power receiving part, 12... Wedge member, 15...
connecting plate.

Claims (1)

[Scope of utility model registration request] The intermediate part of the clamp claw is pivotally supported on the machine body, with one end serving as a clamp part for clamping the mold so as to press it against the bolster, and the other end serving as a power receiving part for receiving the driving force from the driving means, A clamp base is installed below the power receiving portion, and a wedge member is interposed between the clamp base and the power receiving portion of the clamp claw, and the wedge member is reciprocated to move the clamp claw. The power receiving portion of the clamp claw and the wedge member are each provided with a pin member to connect the power receiving portion and the wedge member, and a connecting plate is provided to connect the power receiving portion and the wedge member. The hole in the connecting plate that engages with one of the pins provided on the wedge member is a long hole, and when the wedge member moves in the clamping direction of the clamp claw, the long hole and the pin are different from each other. A mold clamp device for a casting machine, characterized in that the elongated hole and the pin engage with each other when the pin loosely fits and moves in the direction of releasing the clamp.