JPH0224531Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a mold automatic clamper safety device suitable for use in a vertical casting machine.

[Prior art]

Generally, when installing an automatic mold clamping device to a vertical casting machine, vertical die casting machine, low pressure casting machine, etc., it is necessary to provide a mechanism for preventing the mold from falling, especially on the upper mold clamper, from a safety standpoint. However, clampers for upper molds generally have a claw action that presses the flange of the mold, and an action that slides the clamp unit to a position where it does not interfere with the flange of the mold when removing the mold, and most of these are hydraulically driven. .

Conventionally, many of the safety devices for upper die clampers have a hydraulic pressure holding mechanism and a mechanism for preventing sliding. In the former case, there is poor reliability in securing hydraulic pressure in the event of a mechanical abnormality or emergency stop, and there are many cases where I-blocks and the like are messed up. On the other hand, in the latter case, most of them use a method to prevent the clamp unit from sliding with a knock pin or stopper attached to the die base, but not only an actuator for the stopper is added, but the actuator is It was also necessary to take measures to maintain pressure in the Yuator. In any case, in a vertical casting machine, in addition to a mechanism for preventing the movable plate from falling, it was necessary to pay close attention to preventing the mold from falling.

[Purpose of invention]

The purpose of this invention was made in view of the above-mentioned shortcomings.The purpose of this invention is to utilize the machine's mold opening/closing operation to ensure clamper operation during mold change, without adding a special actuator to the clamper, and to ensure safety. To provide a mold automatic clamper safety device that ensures safety.

[Structure of the idea]

In order to achieve this purpose, the present invention
A wire whose upper end is fixed to the upper fixed platen of the machine, a housing fixed to the die base, and which is arranged so as to be movable up and down within the housing, and is always pressed downward by a spring, and whose upper end is attached to the lower end of the wire. and a drop prevention pin whose lower end locking portion protrudes from the housing and engages with a pin of the clamper table.

Hereinafter, details of the present invention will be explained using examples shown in the drawings.

[Example of idea]

FIG. 1 is a sectional view of the main parts of an embodiment of the automatic mold clamper safety device according to the present invention, showing the mold clamping state. In the same figure, reference numeral 1 is a clamp unit, and although details are not shown,
Clamp claw 1a and driving cylinder (not shown)
It is configured to clamp the upper mold 2 of the mold. The clamp unit 1 is connected to a clamper table 3 that is slid to a position where it does not interfere with the flange 2a of the mold 2 when changing the mold. cylinder 6
The screen is configured to slide to the left in the figure.

Further, reference numeral 7 denotes a fall prevention pin, and this fall prevention pin 7 has a structure in which it is slidably built into a housing 8 fixed to the die base 5, and is held by a spring 9 built in the housing 8. Normally, it is pressed downward and the lower end locking portion 7a
protrudes from the housing 8 and comes into contact with a pin 10 provided at the rear of the clamper table 3.

In such a configuration, the fall prevention pin 7
is connected via a rod 11 to an upper platen (not shown) of the machine by a wire 12 fixed at one end, and when no tensile force is applied to the wire 12, that is, except when the mold is closed. The fall prevention pin 7 is pressed downward by the elastic force of the spring 9, and its lower end locking portion 7a contacts the pin 10 at the rear of the clamper table 3, preventing the clamper table 3 from sliding rearward. This makes it possible to prevent the mold from falling. On the other hand, when the mold is closed, the die base 5 descends, and the fall prevention pin 7 is pulled upward by the wire 12, and the lower end locking part 7a is housed in the housing 8, thereby locking the pin at the rear of the clamper table 3. Contact with 10 is canceled.

In addition, in this mechanism, the wire 1 is installed so that the contact between the fall prevention pin 7 and the pin 10 is released when the mold is closed.
The length of 2 has been determined.

In this state, when changing the mold, after the clamp claw 1a in the clamp unit 1 is opened, the clamp unit 1 connected to the clamper table 3 can be slid backward by the slide cylinder 6, and the die base 5 is raised. As a result, the upper mold 2 is separated from the die base 5.

In addition, Figures 2 and 3 are diagrams showing an example in which this clamper is applied to a vertical die-casting machine. Figure 2 shows the mold opening state with the mold clamp, and Figure 3 shows the mold clamping state when the mold is closed. This shows the unit sliding state. In these figures, reference numeral 13 is the upper platen of the vertical die-casting machine, and the wire 12
has a structure in which its lower end is connected to the fall prevention pin 7 via a rod 11, and its upper end is fixed to the upper platen. Note that reference numeral 14 is a driving cylinder for raising and lowering the die base 5 and the upper mold 2 fixed to the die base 5. It is constructed so that it can be raised and lowered.

[Effect of idea]

As explained above, according to the mold automatic clamper safety device according to the present invention, the spring is always pressed downward and the lower end locking part engages with the pin of the clamper table, and when the mold is closed, The structure includes a fall prevention pin that is configured to disengage from the pin of the clamper table by pulling upward against the elasticity of the spring via a wire, ensuring reliable clamping operation. In addition, it is possible to improve safety by eliminating the need for hydraulic pressure retention mechanisms and special actuators to prevent molds from falling, reducing costs and improving maintainability. It is easy to visually check the fall prevention function, etc.
It has various effects.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional front view of essential parts showing an embodiment of the automatic mold clamper safety device according to the present invention, and Figs. 2 and 3 show an example in which the clamper of Fig. 1 is applied to a vertical die-casting machine. In the schematic configuration diagrams, FIG. 2 shows the mold opening state with the mold clamp, and FIG. 3 shows the clamp unit sliding state when the mold is closed. 2...Upper mold, 3...Clamper table, 5...
...Die base, 7... Fall prevention pin, 7a... Lower end locking portion, 8... Housing, 9... Spring, 10... Pin, 11... Rod, 12... Wire, 14... Upper platen.

Claims (1)

[Scope of utility model registration request] a wire whose upper end is fixed to the upper fixed platen of the machine; a housing which is fixed to the die base;
It is disposed in the housing so as to be movable up and down, is always pressed downward by a spring, has an upper end connected to the lower end of the wire, and has a locking part at the lower end protrudes from the housing and engages with a pin of the clamper table. Mold automatic clamper with fall prevention pin and safety device.