JPS6034449B2 - Rubber screen manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a rubber screen used for dividing ore, crushed stone, etc., and particularly to a method of manufacturing a rubber screen that closes desired holes (joints).

Metal knots have traditionally been used to knot and separate iron ore, crushed stone, etc.

However, this metal wheel has the disadvantages of noise, poor durability due to severe wear due to the material used for striations and separation, and a reduction in processing capacity due to its maintenance. In order to eliminate this drawback, rubber nodes, so-called rubber screens, have become widely used, and tend to extend the service life of the streaks. As a manufacturing method of a rubber screen having such advantages, a method of punching out a rubber plate and a method of manufacturing by molding are generally used. However, the former method results in large material loss and high costs, so the latter method is superior in commercialization. The inventor of the present invention previously published Japanese Patent Publication No. 49-34474.
No. 52-10478 and Japanese Patent Publication No. 52-10478 disclosed a method of manufacturing a rubber screen by molding.

However, even when such molding is used, the pitch of the holes (joints) of the rubber screen to be manufactured cannot be set arbitrarily, so the rubber screen is placed on the top of the support frame of the joint device shown in Figures 7 and 8. If the hole is open, the workpiece 6 will fall through the hole, causing wear and damage to the support frame 7, which is a drawback. In order to change the pitch of the holes in the rubber screen, it is naturally necessary to change the mold.

However, since the position of the support frame in the joint device is arbitrarily set, a mold must be unique for each joint device, and the manufactured rubber screen becomes extremely expensive. The purpose of this invention is to eliminate the above-mentioned drawbacks and easily manufacture an inexpensive rubber screen that closes desired holes without going through complicated processes. Place a die with protrusions, place a raw rubber sheet on top of this die,
A release sheet for deburring is inserted between the flat surface of the molding press pressure plate and the raw raw rubber sheet, and the raw raw rubber sheet is pressure-molded. After the pressure plate is unloaded, the release sheet is peeled off to form a rubber screen. During manufacturing, the release sheet is peeled off so as to leave predetermined areas where burred holes are to be formed;
A method of manufacturing a rubber screen, characterized in that the burred holes are filled with a liquid or plastic rubber material.

Next, application of the present invention will be explained in more detail according to the illustrated embodiments. Figure 1 is a cross-sectional view of the rubber screen forming fluidizer after the preparation process is completed, where 1 is the press surface plate, 2
3 is a hole-forming protrusion protruding from the upper surface of the die 2, and 4 is a flat surface parallel to the end face of the hole-forming protrusion 3 in the direction of approaching or separating. A press plate that can be moved up and down is shown, and these plates are the same as conventionally used layering, and a surface plate 1 and a press plate 4 are heated plates for vulcanizing the rubber screen.

Place the raw rubber sheet w on the hole forming protrusion of die 2,
The release sheet t for deburring is placed on top of the raw rubber sheet w.

As for the release sheet t, the present inventor had previously published Japanese Patent Publication No. 49-13.
Preferred are fabric sheets such as the woven fabrics disclosed in No. 4474 and Japanese Patent Publication No. 52-10478, and vulcanized rubber sheets.

After this preparation, the pressing plate 4 is lowered and the material raw rubber sheet w is pressed between it and the die 2 through the release sheet t, as shown in Fig. 2, where the hole forming projections are formed. 3 bites into the raw raw rubber sheet w and separates it to form holes.

In this state, as shown in detail in FIG. 3, the end face of the hole-forming protrusion 3 generates maximum squeezing pressure with the pressure plate 4 via the release sheet t, and the raw rubber sheet w Particularly strong local adhesion occurs between the thin layer film portion left behind from the molding flow and the release sheet t.

The vulcanization process is continued under this pressure, and after the completion of the vulcanization process, the pressure plate 4 is unloaded and lifted up, and the release sheet t is immediately peeled off from the surface of the die 2 as shown in FIG. The membrane portion m strongly locally bound to the rubber sheet t is peeled off from the rubber screen s together with the release sheet t.

When the rubber screen s manufactured in this way is used as is by being attached to a knotting device, as explained with reference to FIGS. There is a risk of damage.

For this reason, in the present invention, holes with burrs are formed at locations corresponding to the hole-forming protrusions 3 that form the holes located in the upper part of the support frame, etc. That is, as shown in FIG. 1, the release sheet t is not placed on the predetermined location in advance, or the release sheet t is cut off so as to leave the predetermined location after the raw rubber sheet w is pressure-formed. tear it off. In the former case, a single release sheet with portions corresponding to predetermined locations cut out may be used. Naturally, local binding does not occur in areas where the release sheet t is not present, so burrs p are generated. After peeling off the release sheet t, the rubber screen s has a large number of burr-free holes as shown in FIG.
A hole h having a diameter is formed.

Next, the holes h in which the burrs p of the rubber screen s remain are closed by filling them with a liquid or plastic rubber material 5, as shown in FIG.

In this case, an adhesive can be used in combination. The liquid or thermoplastic rubber materials used in the present invention include liquid rubbers such as thermoplastic urethane rubber, thermosetting urethane rubber, polybdenum, liquid polybutadiene, and pyrolytic rubber, and ordinary general-purpose rubbers such as methacrylic acid, styrene, and divinylbenzene. There are rubber compositions and thermoplastic rubbers that are dissolved in monomers such as rubber and treated with crosslinking agents.

Further, it is also possible to use such rubber materials with appropriate compounding materials and plasticity added. Since the rubber material 5 to be filled is liquid or plastic and can be of the so-called gravity type, deformation of the rubber screen s does not occur.

After filling the rubber material 5, it is vulcanized and integrated with the rubber screen s.

In this way, it is possible to easily obtain a rubber screen s that closes holes at desired positions corresponding to the support frame, etc., without changing the mold. When a release sheet t is placed on the entire surface of a raw rubber sheet w, a hole with a burr is formed after pressure molding and unloading, and the release sheet t is peeled off leaving the part where the hole is to be closed with the rubber material, it can be used as a release sheet t. It is particularly effective to use woven fabric.

The reason for this is that the remaining portion of the woven fabric that has not been peeled off also serves as a reinforcing material at the bottom of the hole h. According to this invention, it is possible to easily close the holes at predetermined locations among the joints provided in the rubber screen without changing the mold, and the holes once closed with the rubber material can be easily closed without deforming the crosspiece. Since it is integrated with the rubber screen body, the embedded material does not come out during vibration, making it highly durable.

In order to prevent the embedded rubber material from popping out, the side surface of the hole h may be sloped so that it gradually expands downward as shown in Fig. 6b, or the side surface of the hole h may be made oblique as shown in Fig. 6c.
It is also possible to form grooves on the side surface using a knife or a grinder.

When the rubber screen according to the present invention is attached to a joint device, the holes located at the top of the support frame are closed, so the support frame is not worn or damaged, and the durability of the joint device is increased. This will be extremely useful for improving.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of the forming procedure before and after pressurization, showing one embodiment of the rubber screen manufacturing method according to the present invention, Figure 3 is a partial detail view of Figure 2, and Figure 4 is a burr. FIG. 5 is a partial cross-sectional view showing the state of the rubber screen before the holes are closed. FIGS. 6 a, b, and c are partial cross-sectional views of the rubber screen obtained by the present invention. FIG. 7 , FIG. 8 is an explanatory diagram illustrating a conventional example of a joint device equipped with a rubber screen. 1...Press surface plate, 2...Die, 3.
...hole forming protrusion, 4...pressure plate, 5...
Rubber material, 6...Processed product, 7...Support frame, w...Material raw rubber sheet, t...
Release sheet, p...burrs. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1 Place a die equipped with a large number of hole forming protrusions on the molding press surface plate, place the raw raw rubber sheet on this die, and place a release sheet for deburring between the flat surface of the molding press pressure plate and the raw raw rubber sheet. When manufacturing a rubber screen by applying pressure to a material raw rubber sheet and peeling off the release sheet after unloading the pressure plate, the peeling is performed so as to leave predetermined areas where holes with burrs are to be formed. A method for manufacturing a rubber screen, which comprises peeling off a sheet and filling the burred holes with a liquid or plastic rubber material.