JPS6030015Y2 - Molding machine with knock-out mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a knockout mechanism for a molding machine that molds relatively large inorganic sheets such as gypsum board before curing.

Conventionally, as a knockout mechanism for releasing a sheet in such a molding machine, an air knockout system and a system using a mechanical knockout pin are generally used.

Among these, the air knockout method is a method in which an air jet hole is provided in the mold and air at an appropriate pressure is ejected to release the mold. However, if the air is too weak, it will be difficult to release the mold, and if the air is too strong, it will damage the sheet surface. In many cases, the sheet cannot be released from the mold unless air is applied strong enough to damage the sheet surface. Also, in the case of sheets laminated in multiple layers, air may enter between the layers of the sheet and There was a drawback that peeling occurred.

Therefore, the air knockout method is considered to be impractical for sheet forming machines.

On the other hand, the knock-out pin method is a method in which the knock-out pin 18 protrudes from the molding surface of the mold when the mold is opened, as shown in Fig. 1, and is relatively effective for mold release. As shown in Figure 1, since the lower end 14 of the knockout pin 8 protrudes from the molding surface 18 of the mold, it is difficult to apply mold release oil to the molding surface 18 of the mold or to clean the molding surface 18 of the mold. There was a drawback that the knockout pin 8 got in the way when doing so.

The present invention aims to eliminate these drawbacks of the conventional knockout pin method.

The configuration of the present invention will be described below with reference to the illustrated embodiment. As shown in FIGS. 2 to 4, an arm 5 is mounted on the upper surface 4 of the movable mold 1 of a molding machine 3 consisting of an upper movable mold 1 and a lower fixed mold 2. The center portion 6 is rotatably supported, the upper end 9 of a knockout pin 8 is rotatably supported at one end 7 of the arm 5, and the knockout pin 8 is biased downward by a spring. A first pressing spring 10 is attached, an arm reversing pin 12 is arranged above the movable mold 1 at an appropriate interval and facing the other end 11 of the arm 5, and the first pressing spring is attached to the arm reversing pin 12. A second pressure spring 13 with a larger spring constant than 10
is attached, and the arm reversing pin 12 is urged downward by a spring, and the lower end 14 of the knockout pin 8 is normally made to elastically protrude from the molding surface 18 of the movable mold 1, and when the movable mold 1 is fully opened, the knockout pin 8 is moved to the movable mold. 1.

A long hole 15 is provided in one end 7 of the arm 5, and by fitting a shaft support pin 16 projecting from the side surface of the upper end 9 of the knockout pin 8 into the long hole 15, the arm 5 and the knockout pin 8 are connected. and are connected to each other.

In the embodiment shown in FIG. 2, a stopper 17 biases the knockout pin 8 downward by receiving a pressing force from the first pressing spring 10, so that the stopper 17 comes into contact with the upper surface 4 of the movable mold 1. This restricts the protrusion length of the lower end portion 14 of the knockout pin 8.

In FIG. 2, a shows a state in which the movable mold 1 is open and the lower end 14 of the knockout pin 8 protrudes from the molding surface 18, and b shows a state in which the movable mold 1 is fully opened and the lower end 14 of the knockout pin 8 is exposed. It shows the state drawn into the movable mold 1.

The movements of the knockout pin 8 when the movable mold 1 is opened are shown in FIGS. 4a, b, and c.

Figure a shows the state when the sheet 20 is in the plate shape, and the knockout pin 8 is pulled into the movable mold 1 against the pressing force of the first pressing spring 10, but as shown in the figure Movable type 1
When the knockout pin 8 is pulled upward slightly, the knockout pin 8 protrudes from the molding front surface 18 and releases the sheet 20 from the mold.

Furthermore, when the movable mold 1 is fully opened as shown in FIG. The lower end 14 is drawn into the movable mold 1.

This pressure spring 13 with a porosity of 2 absorbs variations in the upper limit stop position of the movable mold 1 and prevents the knockout pin 8 from being suddenly pulled in and damaging the mold or damaging the knockout pin 8. It is something.

Therefore, it is desirable that the second pressure spring 13 be made stronger than the first pressure spring 10 by about 20% to 1 width u.

Next, in FIG. 2, reference numeral 19 denotes an oil application roller, which applies mold release oil to the molding surface 18 when the movable mold 1 is in the fully open state.

As is clear from a comparison and contrast between the conventional example shown in FIG. 1 and the present invention shown in FIG. Since it is retracted, the mold release oil can be applied uniformly over the entire molding surface 18, thus making it easier to release the sheet 20 from the mold.

FIG. 3 shows another embodiment of the present invention, in which a plate spring-like member is used as the first pressure spring 10' to simplify the structure, and an air cylinder is used as the second pressure spring 13'. The above-mentioned shock absorption ability of the second pressure spring 13' is further improved by using an air spring using a hydraulic cylinder, a hydraulic spring using a hydraulic cylinder, or the like.

As described above, in the present invention, the center part of the arm is rotatably supported on the upper surface of the movable mold of a molding machine consisting of an upper movable mold and a lower fixed mold, and a knockout pin is attached to one end of the arm. The upper end is rotatably supported, a first pressure spring is attached to the knockout pin to bias the knockout pin downward, and the arm faces the other end of the arm at an appropriate distance above the movable mold. The arm reversing pin is provided with an arm reversing pin, and a second pressing spring having a spring constant larger than the first pressing spring is attached to the arm reversing pin to bias the arm reversing pin downward, so it is a movable type. When opening, the lower end of the knockout pin elastically protrudes from the molding surface of the movable mold, allowing the sheet to be easily and reliably released from the mold.Moreover, when the movable mold is fully opened, the lower end of the knockout pin retracts into the movable mold. This has the advantage that it is possible to easily apply mold release oil to the molding surface, clean the molding surface, etc. without being hindered by the knockout pins.

In addition, in the present invention, the second pressure spring is attached to the arm reversing pin for retracting the knockout pin into the movable mold, so even if there is slight variation in the upper limit stop position of the movable mold, the second pressure spring This has the advantage that strict precision is not required for the upper limit stop position of the movable mold in order to absorb this variation, and the shock absorption force of the second pressing spring causes the knockout pin to be pulled in suddenly, which may damage the mold. Alternatively, it has the advantage of being able to prevent the knockout pin from being damaged.

[Brief Description of the Drawings] Figure 1 is a side view of a conventional molding machine with a knockout mechanism, Figures 2a and b are side views of a molding machine with a knockout mechanism according to an embodiment of the present invention, and Figure 3. 4 is a side view of another embodiment same as the above, and FIGS. 4 at b and c are side views showing the operating state of the embodiment of FIG. 2. 1 is a movable mold, 2 is a fixed mold, 3 is a molding machine, 4 is a top surface of a movable mold, 5 is an arm, 6 is a central part, 7 is one end, 8 is a knockout pin, 9 is an upper end, 10 is a first A pressure spring, 11 is the other end, 12 is an arm reversing pin, 13 is a second pressure spring, 14 is a lower end, and 18 is a molding surface.

Claims (1)

[Scope of utility model registration request] The center part of an arm is rotatably supported on the upper surface of a movable mold of a molding machine consisting of an upper movable mold and a lower fixed mold, and the upper end of a knockout pin is rotatably supported on one end of the arm. A first pressing spring that biases the knockout pin downward is attached to the knockout pin, and an arm reversing pin facing the other end of the arm is disposed above the movable mold at an appropriate interval to reverse the arm. A second pressing spring having a spring constant larger than that of the first pressing spring is attached to the pin to bias the arm reversing pin downward, and the lower end of the knockout pin is normally made to elastically protrude from the molding surface of the movable mold. A molding machine with a knockout mechanism that retracts the knockout pin into the movable mold when the movable mold is fully opened.