JP3117602B2 - Molding machine for rigid synthetic resin foam board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding machine for bending a rigid synthetic resin foam plate such as a thick foam polystyrene plate which is effectively used as a heat insulating material.

[0002]

2. Description of the Related Art Conventionally, rigid synthetic resin foam boards such as polystyrene foam boards and vinyl chloride foam boards have low thermal conductivity, are lightweight, and have the required mechanical strength. Widely used as. However, this type of rigid synthetic resin foam board usually has low resistance to bending, so if you try to stick it along a curved wall like a cylindrical tank, the foam board will crack, and in some cases it will break. Everywhere.

In order to avoid this, a hard synthetic resin foam plate is cut into a shape along a curved surface, and a number of cutouts are cut in the inner surface of the heat insulating plate so that a curvature can be easily obtained.
Foaming is performed from the beginning into a shape with curvature, but it takes time to process, it is difficult to obtain a large number of uniform heat insulation properties, or for surfaces with different curvatures Is not applicable as it is.

The present inventors have conducted many studies and experiments on such a method for improving the bending properties of a rigid synthetic resin foam board, and by attaching a nonwoven fabric to the surface of the rigid synthetic resin foam board, It has been found that the bending properties of the rigid synthetic resin foam plate are greatly improved, and based on the finding, the rigid synthetic resin foam plate having a nonwoven fabric adhered to at least one surface of the rigid synthetic resin foam plate is heat-insulated. It has already been proposed as a material (see Japanese Patent Application No. 5-192519).

[0005] According to the rigid synthetic resin foam plate heat insulating material proposed above, even when the rigid synthetic resin foam plate heat insulating material is largely curved along the curvature surface with the nonwoven fabric surface side adhered to the outside facing outward. The rigid synthetic resin foam plate does not break, and even when the bending load is released, the curved curvature is maintained almost as it is. Thereby, the heat insulating material of the rigid synthetic resin foam board according to the above proposal can be effectively used in heat insulation construction on a wall surface of a cylindrical structure such as an LP gas tank.

However, as described above, the rigid synthetic resin foam board has conventionally been considered to have a low resistance to bending. There is no device capable of imparting a bend, and at the time of heat insulation construction, a large number of curved rigid synthetic resin foam insulation having the same curvature, or a curved rigid synthetic resin foam insulation having a different curvature is used. In fact, it is extremely difficult to prepare many sheets in a short time.

As a device for bending a metal plate such as a steel plate, a three-roll type bending device as shown in FIG. 3 or a four-roll type bending device as shown in FIG. 4 is known and used effectively. ing. In the three-roll bending apparatus shown in FIG. 3, a main roll 1 and a pair of pinch rolls 2 and 3 are arranged in parallel and opposed to each other, and the distance between the main roll 1 and the pinch rolls 2 and 3 can be adjusted. It has become. In the bending process, after adjusting the distance between the main roll 1 and the pinch rolls 2 and 3 and then driving the main roll 1 by inserting the end of the steel plate P as a workpiece, the steel plate P has a circular cross section. It is bent continuously in an arc. By changing and adjusting the distance between the main roll 1 and the pinch rolls 2 and 3, the bending curvature of the steel sheet P is adjusted.

[0008] In this bending machine, the steel plate P to be processed is
Since it is impossible to bend both ends of the sheet to a predetermined curvature, both ends P ₁ and P ₂ are previously formed to a predetermined bending curvature by press molding or the like, and then inserted into a bending machine. Will be The four-roll bending machine shown in FIG. 4 has a configuration in which a press roll 4 that can move up and down is provided between the pinch rolls 2 and 3, and the steel sheet P can be sandwiched between the press roll 4 and the main roll 1. . By raising the pinch rolls 2 or 3 in a state where the pressing roll 4 is sandwiched steel sheets P between the main rolls 1, since it is possible bending the ends P ₁ or P _2, 3-roll bending machine There is an advantage that there is no need to separately bend the end portion by means such as press molding as in the case of (1).

[0009]

However, the conventional roll type bending apparatus of the type shown in FIG. 3 or FIG. 4 which is used for bending a steel plate is not suitable for continuous bending of a thick rigid synthetic resin foam plate. Can not be used. One reason is that in any of the three-roll or four-roll bending machines, the bending of the ends requires
First, a predetermined bending is performed by applying a load to the inner side while holding only one end of the workpiece (in a cantilevered state). Because the resin foam plate is easily crushed by the holding pressure, the end cannot be held by the holding pressure enough to withstand the bending load, and the bending of the end cannot be performed. Therefore, if it is attempted to bend a flat hard synthetic resin foam plate using a three-roll bending machine for a steel sheet, the leading end in the feed direction is a pinch roll at the leading end in the feed direction (the pinch roll in FIG. 3). It collides with the surface of (2) and cannot get over it, and bending does not proceed.

In any of the three-roll and four-roll bending machines, when the rigid synthetic resin foam plate is fed and bent under a low clamping pressure that does not cause crushing, the hard synthetic resin foam plate is hardened. The main roll 1 slips on the surface of the synthetic resin foam board, and the feeding of the hard synthetic resin foam board stops. Furthermore, a bending machine for a steel plate is usually a thick rigid synthetic resin foam plate (about 25 to 100 mm).
It is difficult to set the necessary distance between the main roll and the spin roll as it is, and various hard synthetic resin foams curved to different curvatures are not planned. It is extremely difficult to freely adjust the distance in order to manufacture a board.

Accordingly, an object of the present invention is to provide a novel rigid synthetic resin foam plate which can be continuously bent from one end to the other end without causing crushing due to a clamping pressure. An object of the present invention is to provide a molding machine for synthetic resin foam boards. It is another object of the present invention to provide a novel bending machine for a rigid synthetic resin foam plate, which can easily produce a curved rigid synthetic resin foam plate having a different curvature.

[0012]

SUMMARY OF THE INVENTION According to the present invention, there is provided, according to the present invention, a holding roll which is rotatably mounted on a machine frame above two support rolls whose axes are parallel to each other. A support roll is disposed so as to be rotatable and vertically movable so as to be parallel to the axis of the support roll, and a tension roll having a parallel axis below the two support rolls. This is achieved by a molding machine for a rigid synthetic resin foam plate, wherein a flat belt is wound around the tension roll.

It is a preferable embodiment to form a large number of concave and convex grooves extending in the axial direction on the peripheral surface of the pressing roll, thereby further achieving the object.

[0014]

The present invention will be described in more detail with reference to the following examples. FIG.
1 is a front view of an embodiment of a molding machine for a rigid synthetic resin foam plate according to the present invention, and FIG. 2 is a side view thereof.

This molding machine basically has two support rolls 20 and 20 which are rotatably mounted on the machine frame 10 and whose axes are parallel to each other, and a number of support rolls 20 located above the support rolls 20 in the axial direction. And a press roll 30 having an uneven groove 35 formed thereon. The machine frame 10 includes a base 12 having carriers 11 mounted at four corners, and vertical support frames 13, 13 erected on both sides of the base 12, and the height of the vertical support frames 13, 13. The two support rolls 2
Numerals 0 and 20 are arranged parallel to each other with a predetermined inter-axis distance, and are rotatably mounted by bearings 21 and 21.

At the lower position of the support rolls 20, 20, a tension roll 40 having an axis parallel to the axis of the support rolls 20, 20 is mounted via a bearing 43 so as to be vertically movable and rotatable. And the support roll 2
0, 20 and the tension roll 40 have a flat belt 50.
Is wound. Although not shown, the tension roll 40 is constantly urged downward by a spring, and applies a predetermined tension to the flat belt 50. The flat belt 50 is preferably made of a material in which a woven fabric such as nylon, cotton, or polyester is used as a core material, and a resin such as polyurethane rubber, polyamide, polyester, or polyvinyl chloride is coated or bonded thereto. From the viewpoints of required strength and slip resistance, it is particularly preferable to use a material in which nylon fiber is coated with polyurethane rubber.

One vertical support frame 13 has a geared motor 6
The drive chain 61 is wound between the sprockets 21, 21 attached to the support rolls 20, 20 and the geared motor 60. The holding roll 30 is mounted substantially above the center between the axes of the two support rolls 20, 20 between the vertical support frames 13, 13 so as to be vertically movable with respect to the vertical support frames 13, 13. ing. That is, elevating guide rails 31, 31 are provided in the vertical support frames 13, 13 in the vertical direction, and an elevating block 33 having a bearing 32 is supported by the elevating guide rails 31, 31 so as to be able to move up and down. . The pressing roll 30 is supported by the bearings 32, 32. The elevating block 33 is configured to move vertically along the elevating guide rails 31, 31 by the rotation of a rotating shaft 71 rotatably supported by the vertical support frames 13, 13.

Worm oils 72, 72 are provided on the upper ends of the rotating shafts 71, 71, respectively. A transmission shaft 73 having worms at both ends which mesh with the worm oils 72, 72 is provided above the vertical support frames 13, 13. Is provided. Then, the transmission shaft 73 is rotated by a rotation shaft 76 connected to the handle 75 via appropriate gear transmission means. In FIG. 2, 100a and 100b are rigid synthetic resin foam plates, and 90 is a guide for supporting and supporting the rigid synthetic resin foam plate 100 provided as necessary.
In FIG. 1, reference numeral 15 denotes an operation panel, through which the operator drives, stops, and drives a geared motor 60 (not shown) for driving the support rolls 20, 20 and the holding roll 30 through the operation panel 15. Performs forward / reverse rotation switching.

Next, the operation of the bending apparatus will be described by taking as an example a case where a rigid synthetic resin foam plate 100 which is flat and has a nonwoven fabric adhered on one surface is formed. First, the handle 75 is operated to adjust the height of the press roll 30 to a position corresponding to the thickness of the rigid synthetic resin foam plate 100a to be bent and the radius of curvature to be applied. That is, the distance between the upper surface of the flat belt 50 wound around the support rolls 20 and the lowermost surface of the holding roll 30 is at least shorter than the thickness of the rigid synthetic resin foam plate 100a to be bent. The radius of curvature of the rigid synthetic resin foam plate 100a changes depending on the magnitude of the distance.

Next, the operator operates the operation panel 15 to drive the geared motor to give the holding roll 30 a rotation in the direction of the arrow a, and also give the flat belt 50 a movement in the direction of the arrow a. In this state, the flat synthetic resin foam plate 100 a is inserted between the holding roll 30 and the flat belt 50 with the nonwoven fabric surface facing the flat belt 50. The inserted flat rigid synthetic resin foam plate 100a is transferred rightward in FIG. 2 by the rotation of the holding roll 30 and the movement of the flat belt 50. With the transfer, the flat belt 50 is
The flat rigid synthetic resin foam plate 100a is curved upward by the bending and the pressing force of the pressing roll 30, whereby the flat rigid synthetic resin foam plate 100a is curved upward. The front end of the curved rigid synthetic resin foam plate 100a is guided by the flat belt 50 and passes over the support roll 20 located in front.

In response to the deflection of the flat belt 50 during the transfer of the rigid synthetic resin foam plate 100a, the tension roll 40 rises against a spring force which constantly urges the tension roll 40 downward. Thereby, the tension of the flat belt 50 is kept constant. As a result, when the rigid synthetic resin foam plate 100a has passed below the holding roll 30, the hard synthetic resin foam plate 100a is subjected to a bending process having substantially the same radius of curvature over its entire length. The shape is as follows. The processed hard synthetic resin foam plate 100b is taken out of the machine.

If necessary, the operation panel 15 is operated at the time when the bending process is completed, so that the pressing roll 30 and the flat belt 50 are turned and moved in the opposite directions. Thereby,
The already curved rigid synthetic resin foam board 100b is transported again in the opposite direction (to the left in FIG. 2) and subjected to the same bending. This improves the shape retention of the curvature,
The processed product can be taken out from the inserted side, and the operation is further simplified.

In this embodiment, the pressing roll 30
Are formed on the surface of the hard synthetic resin foam plate 100a, since a number of uneven grooves 35 are formed in the axial direction, and the uneven grooves 35 rotate while meshing with the surface of the hard synthetic resin foam plate 100a. Is more certain. When it is desired to further increase the curvature, the holding roll 30 is further lowered by operating the handle 75 and the supporting rolls 20 and 20 are moved.
Surface of the flat belt 50 wound around and the holding roll 30
The same operation is performed with the distance to the lowermost surface set to be shorter.

The above description is only one embodiment of the molding machine for a foamed rigid synthetic resin sheet according to the present invention, and there are many other variations. For example, the pressing roll 30 has a surface formed with a large number of concave and convex grooves 35 extending in the axial direction. However, the concave and convex grooves 35 ensure the feeding of the rigid synthetic resin foam plate and have a large curvature. It is provided for the purpose of obtaining the synthetic resin foam plate, and is not necessarily required, and the flat roll can sufficiently achieve the purpose depending on the material or thickness of the rigid synthetic resin foam plate to be bent. You. The material of the press roll 30 is not limited to a metal material, but may be a rubber or a resin material.

It will be easily understood that the flat belt 50 may be a belt-shaped belt or a linear belt. Further, the means for constantly urging the tension roll 40 downward is not limited to the spring force, and a pneumatic or hydraulic actuator may be used as appropriate. Further, the tension in the initial state of the flat belt 50 may be adjustable by any conventionally known means such as adjusting the tension roll 40 to a spring force that constantly urges the tension roll 40 downward.

Although not particularly shown, the support rolls 20, 20
May be changed so that a hard synthetic resin foam plate having a desired curvature can be obtained more easily. Next, an example in which a hard synthetic resin foam plate is actually bent using the above-described forming machine will be described.

Extruded expanded polystyrene plates having a density of 27 kg / m ³ (trade names: Eslenfoam SG, manufactured by Sekisui Chemical Co., Ltd.), 25 mm, 50 mm, 75 mm, 100 m
m, each having a thickness of
Vinyl acetate based hot melt adhesive 50 g / m ² The coated polyester nonwoven fabric (manufactured by Asahi Kasei Corporation,
Product name: Spunbond Eltas P03070) about 1
It was stuck with a hot roll at 30 ° C.

These specimens (910 mm (width) × 18
20 mm (length)) was bent with a molding machine having the form shown in FIGS. 1 and 2 with the side on which the nonwoven fabric was not adhered facing up. The pressing roll 30 was 75 mm in diameter, and was a flat roll and a V-cut groove type. At this time, the support roll 20 has a diameter of 100 mm, and the center distance is 280 mm.
The distance between the lower surface of the holding roll and the upper surface of the flat belt wound between the supporting rolls is 10 mm for a 25 mm thick test piece, 23 mm for a 50 mm thick test piece,
It was 50 mm for a 75 mm thick specimen and 70 mm for a 100 mm thick specimen.

Table 1 shows the radius of curvature of the product obtained by bending.

[0030]

[Table 1]

No change in the radius of curvature with the passage of time was observed.

[0032]

According to the present invention, a rigid synthetic resin foam board such as a thick foamed polystyrene board which is effectively used as a heat insulating material can be bent by a simple operation using the rigid synthetic resin foam board forming machine according to the present invention. It can be performed.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a molding machine for a rigid synthetic resin foam board according to the present invention.

FIG. 2 is a side view of one embodiment of a molding machine for a rigid synthetic resin foam plate according to the present invention.

FIG. 3 is a diagram illustrating an example of a metal sheet bending machine.

FIG. 4 is a view for explaining another example of a metal plate bending machine.

[Explanation of symbols]

100: Hard synthetic resin foam plate, 10: Machine frame, 20: Support roll, 30: Holding roll, 40: Tension roll, 50: Flat belt, 60: Geared motor. 75 Handle for lifting and lowering the holding roll

Claims (2)

(57) [Claims] 1. A press roll is rotatably mounted above two support rolls whose axes are rotatably attached to a machine frame so as to be parallel to the axes of the two support rolls. It is arranged so as to be able to move up and down in the vertical direction. Further, a tension roll having a parallel axis is arranged below the two support rolls, and a flat belt is wound around the support roll and the tension roll. Molding machine for rigid synthetic resin foam board. 2. A molding machine for a rigid synthetic resin foam plate according to claim 1, wherein a large number of concave and convex grooves are formed in the surface of said press roll in the axial direction.