JPH0242061B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for molding a flanged cylindrical object used for pneumatic fenders and the like.

The conventional method for molding cylindrical objects made of flexible materials used for pneumatic fenders, etc. is to sequentially insert an unvulcanized outer rubber sheet and reinforcement inside an outer mold (hereinafter referred to as outer mold in this explanation). The rubberized cloth is repeatedly pasted several times, and the inner rubber sheet is pasted by hand, including the flange, but with each layer pasted, the inner rubber sheet is pasted again to prevent air from remaining inside. In order to prevent wrinkles from forming on the material, the wrinkles are smoothed out using a hand roller or the like, that is, stitching is performed.

However, the dimensions of the cylindrical objects used for such pneumatic fenders generally range from 600 to 1,800 mm in inner diameter and from 450 to 1,500 mm in length. When manual work is required, the material sheet must be divided into parts to make it easier to paste.

Therefore, it takes a considerable amount of time to apply one layer to the inside of the outer mold, and furthermore, the number of man-hours required to complete the entire molding operation including the stitching operation is enormous.

In particular, for the flange part, the same material as the cylindrical part may be stretched radially and pasted, or a material cut into a separate circle may be pasted, but in either case, it must be pasted uniformly without any gaps, including the curved part. Out of necessity,
Manual work accounts for an extremely large proportion of the total man-hours, and manual work poses quality problems.

In other words, there is a high possibility that air may be mixed in during processes such as the process of applying material sheets for each layer, the need to separate the material itself, and the stitching of hand rollers, and the product after molding and vulcanization. There was a high risk of problems such as peeling off.

Therefore, the present invention solves the huge amount of manual labor and quality problems in the conventional method for molding a flanged cylindrical object, and provides a molding method that can quickly and high quality mold a flanged cylindrical object. The object of the present invention is to provide a method and an apparatus therefor.

That is, in the method for molding a flanged cylindrical object of the present invention, a cylindrical molded object is formed by wrapping a flexible material around the outer periphery of an air bag fitted in a cylindrical molding drum, and then the cylindrical molding is performed. After covering the object with the flanged outer mold, the air bag is inflated to uniformly press the cylindrical molded object over the entire inner surface of the outer mold, and then both ends of the cylindrical molded object are covered with the flanges of the outer mold. It is characterized in that the flange is pasted from the inner circumference to the outer circumference of the flange.

Furthermore, the apparatus for molding a flanged cylindrical object of the present invention fixes a molding drum fitted with a cylindrical air bag to a rotatable cantilever shaft, and moves the flanged outer mold between the position of the molding drum and the standby position. The present invention is characterized in that link type expanders are disposed radially on both sides of the molding drum and are capable of expanding the diameter of the expansion member along the flange of the outer mold.

Embodiments of the present invention will be described below with reference to the drawings.

First, the apparatus directly used in the method of the present invention will be explained.

FIG. 1 is an overall perspective view of a molding apparatus for a flanged cylindrical object according to an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged side sectional view of a partial cross section of the main part around the molding drum shown in the figure, and FIG. 3 is a front view of the main part of FIG. 2.

In Fig. 1, 1 is a link type expander;
2 is an air bag, these are cantilever shaft 3
-1, and is rotatably supported by the power head 3.

Further, the movable cart 5 moves on the rail 8 together with an under roller 6 that rotates the outer mold 4 by a motor 7. On the other hand, a movable stitcher stand 9 moves on a rail 14 together with a rotary actuator 11 that rotates a stitcher roll 10 and a lever 13 using compressed air a sent from an air hose 12.

Next, FIG. 2 shows that the outer mold 4 shown in FIG.
The cylindrical molded object 15 during molding, the air bag 2, and the link type expander 1 are shown covered with the outside, and the free roller indicated by 1-1 is a part of the link type expander 1, and the lever 1 - It is attached to the tip of 2.

The other end of the lever 1-2 is connected to the air cylinder 1-2.
The brackets 1 to 4 are divided into equal parts on the circumference of the brackets 1 to 4 that move at 3.

Below, the process of operating these will be explained step by step. First, the air bag 2 and link type expander 1 attached around the molding drum 16 shown in FIG. The molding operation starts with the outer mold 4 located outside the molding unit consisting of the link type expander 1 and the air bag 2.

First, on the air bag 2 around the molding drum 16 attached to the power head 3,
The inner rubber sheet, which is a molded sheet material whose width has an allowance for the height of the flange of the outer mold 4 with a flange, several sheets of reinforcing rubberized cloth, and the outer rubber sheet are attached to the drive motor 3-2 in that order. By driving the cantilever shaft 3-1, the air bag 2 is wound around the rotating air bag 2, and the cylindrical molded object 15 is
make.

During this time, if necessary, the stitcher roll 10 is applied to the outside of the cylindrical molded object 15 for the purpose of crimping the sheets and preventing air from entering, and the cantilever shaft 3-1 is rotated to close the air bag 2 and the link. The stitching work is performed by rotating a molding unit consisting of a type expander 1 and the like.

The cylindrical molded object 15 shown in FIG. 2 is in the state indicated by arrow A indicated by the broken line in the figure up to the above-mentioned step.

Next, the outer mold 4 shown in FIG. 1 is carried to the airbag 2 by the moving cart 5, and the positional relationship thereof becomes the state shown in FIG. 2.

After that, air bag 2 moves cantilever shaft 3-1
When the cylindrical molded object 15 is expanded or inflated by the compressed air a supplied through the center of the cylindrical mold 15 and changes from the state shown by the arrow E to the state shown by the arrow F, the cylindrical molded object 15 is forcibly expanded and crimped onto the inner surface of the outer mold 4. broken line A
The state changes from the state to the state shown by the solid line B.

The next step is to simultaneously operate the air cylinders 1-3 on each side and move the brackets 1-4 inward.With arrow G as the fixed fulcrum, the tips of levers 1-6 will move to lever 1. The free roller 1-1 follows the link mechanism of the link type expander 1 because the length of lever 1-2 is the same as the length of lever 1-6. As shown in FIGS. 2 and 3, arrows V are radially directed toward the cantilever shaft 3-1.
expands in the vertical plane.

As a result, a plurality of free rollers 1-- at the tip of the lever 1-2 are connected via the coil springs 1-5.
1, the cylindrical molded object 15 in the state shown by arrow B is bent 90 degrees in the radial direction, expanded along the flange surface of the outer mold 4, and transformed into the state shown by arrow C.

Here, since the free roller 1-1 is connected to the coil spring 1-5, the cylindrical molded object 1
5 to the outer mold 4 while expanding it, as shown by arrow D.
Stop at the position.

Note that free rollers 1-1, which are expansion members, are provided on both sides of the molding drum 16.
Alternatively, a non-rotating sliding and fixing member may be used to fulfill its function.

Next, the link type expander 1 contracts and returns to its original position, and when the compressed air a is removed from the air bag 2, the air bag 2 returns to the state shown in E in FIG. There will be a gap.

Note that stitching on the flange surface can also be carried out by rotating the stitcher roll 10 via the rotary actuator 11 to press the stitch roll 10 onto the flange surface, and then rotating the outer mold 4 with the motor 7. This is also possible even when the movable trolley 5 is in the position shown in FIG.

In this case, the movable stitcher table 9 is moved to the movable dolly 5.
and perform the same operation as above.

Furthermore, stitching on the inner cylindrical portion of the outer mold 4 can be easily performed because the stitcher roll 10 can move inside the outer mold 4 together with the lever 13.

A lid mold is attached to the molded outer mold 4, placed in a steam can, vulcanized, and pulled out after cooling.

Therefore, the outer mold 4 can be divided into upper and lower halves as shown in FIG.
and separation from the product of the cylindrical molded object 15 after vulcanization,
That is, the mold release operation is easily performed.

As described above, the method of the present invention involves covering a cylindrical molded object formed by wrapping a flexible material around the outer periphery of an air bag fitted in a cylindrical molding drum with a flanged outer mold. Then, by inflating the air bag, the cylindrical molded object is uniformly pressed against the entire inner surface of the outer mold, and then both ends of the cylindrical molded object are attached to the flange of the outer mold on the inner circumference of the flange. Since the cylindrical molded object is pasted toward the outer periphery, both ends of the cylindrical molded object can be efficiently pasted to the flanges of the outer mold while allowing air between the outer mold and the cylindrical molded object to escape. Therefore, since air is not entangled between the cylindrical molded object and the flange of the outer mold, it has become possible to efficiently mold a high-quality flanged cylindrical object without deformation. Further, since no human labor is required when forming the flange portion, automation is possible, and productivity can be further increased.

On the other hand, the device of the present invention fixes a molding drum fitted with a cylindrical air bag to a rotatable cantilever shaft, and allows a flanged outer mold to be moved between the molding drum position and a standby position, In addition, link type expanders that can expand the diameter of the expansion member along the flange of the outer mold are arranged radially on both sides of the molding drum, so that the air between the outer mold and the cylindrical molded object can be removed even though the mechanism is simple. Both ends of the cylindrical molded object can be efficiently attached to the flanges of the outer mold while letting the objects escape. Therefore, since air is not entangled between the cylindrical molded object and the flange of the outer mold, a high quality flanged cylindrical object without deformation can now be molded at low cost. Further, since no human labor is required when molding the flange portion, automation is possible, and productivity can be further increased.

The present invention can also be effectively applied to other fields of application, such as the work of applying rubber lining to flanged metal pipes.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a molding apparatus for a flanged cylindrical object according to an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged side view showing a partial cross-section of the peripheral essential parts of the molding drum shown in the figure, and FIG. 3 is a front view of the essential parts of FIG. 2. 1... Link type expander, 1-1... Free roll, 2... Air bag, 3... Power head, 3-
DESCRIPTION OF SYMBOLS 1... Cantilever shaft, 3-2... Drive motor, 4... Outer mold, 5... Moving trolley, 15... Cylindrical molded object, 16... Molding drum.

Claims (1)

[Scope of Claims] 1. A cylindrical molded object is formed by wrapping a flexible material around the outer periphery of an air bag fitted in a cylindrical molding drum, and then an outer mold with a flange is placed over the cylindrical molded object. After that, the cylindrical molded object is uniformly pressed against the entire inner surface of the outer mold by inflating the air bag,
A method for molding a flanged cylindrical object, wherein both ends of the cylindrical molded object are then attached to flanges of an outer mold from the inner circumference to the outer circumference of the flange. 2. A molding drum fitted with a cylindrical air bag is fixed to a rotatable cantilever shaft, and an outer mold with flanges is movable between the molding drum position and a standby position, and a molding drum is provided on both sides of the molding drum. A molding device for a flanged cylindrical object, in which link type expanders capable of expanding the diameter of an expansion member along a flange of an outer mold are respectively arranged radially.