JPH0328304B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a molding device for resin bent pipes.

Conventional technology Conventional methods for molding curved pipes made of resin such as FRP include the lob-jointing method, in which diagonally cut straight pipes are joined and molded, and the hand molding method, in which a resin layer is manually laminated onto a curved pipe core. There is a lay-up method, a method in which a curved pipe core is rotated around its axis, and roving is wrapped around it. Among these methods, the method of rotating the bent pipe core metal can be automated and is an excellent method for stabilizing quality and reducing man-hours. In this conventional method of rotating a curved tube core, a rotation axis parallel to the tangent to the central axis of the curved tube core is set at the longitudinal center of the curved tube core, and the rotation axis is rotated around this rotation axis. The roving is wrapped around the bent pipe core while rotating it.

Problems to be Solved by the Invention However, with such conventional methods, it is difficult to wrap the roving smoothly around the part where the axial tangent of the core metal is parallel to the rotation axis, that is, the center of the core metal. However, as one moves toward both ends of the core metal, the axis tangent of the winding portion becomes angular with respect to the rotation axis. As a result, the angle between the rotating shaft and the surface on which the roving is wound deviates from 90 degrees, so unless the roving is moved back and forth in the length direction of the core metal each time the core metal rotates, the winding can be done properly. The problem arises that it cannot be carried out. Therefore, problems still remain in improving productivity and stabilizing quality.

To solve these problems, there is a device proposed in, for example, Japanese Patent Laid-Open No. 56-95636. This is achieved by moving the core metal for curved pipes that rotates around its axis along its length, that is, along an arc-shaped path, so that the roving wrapping surface is always perpendicular to the axial tangent of the core metal at the wrapping position. It was designed so that However, this Japanese Patent Application Publication No. 56-95636
In the device disclosed in the publication, the core bar must be moved a considerable distance along the arcuate path;
Moreover, there is a problem in that a complicated link mechanism is required to ensure this movement.

Therefore, the present invention solves these problems and allows the winding surface of the roving to be moved around the core metal at the wrapping position without moving the core metal in its length direction or without using a complicated device. The purpose is to be able to always maintain the axis perpendicular to the tangent line.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a structure in which a curved tube core rotatable around an axis is rotatable around one longitudinal end of the curved tube core. One end of the shaft is rotatably connected to the other end of the metal, and the other end of the shaft is configured to be rotatable around a point at a distance from the curved pipe core. The core bar is configured to be able to be rotated by rotating the shaft, and the shaft body is provided with a rotation direction selection device, and the rotation direction selection device is configured to rotate the core metal in a first direction and the first direction. The shaft includes a pair of springs that can bias the shaft body to pass through the dead center in an opposite second direction, and means for selectively applying a biasing force to one of the springs. be.

Function: With such a structure, the winding surface of the roving can be adjusted to the winding position by simply turning the curved pipe core metal using the shaft body, without moving the core metal in its length direction. It is perpendicular to the axial tangent of the core metal. Further, by rotating the shaft body, it is possible to easily rotate the core metal. Furthermore, since a turning direction selection device having a pair of springs and a means for selectively applying a biasing force to one of the springs is provided, by appropriately switching this turning direction selection device, the dead center passage will be ensured.

Examples Examples of the present invention will be described below. 1st
Figures 1 to 2 show an embodiment of the present invention, in which reference numeral 1 denotes a curved tube core metal, one lengthwise end of which is rotatably attached to the end of a shaft 3 via a connecting portion 2. The turning range of the curved tube core metal 1 is set to approximately the bending angle range thereof. 4 is a motor for rotationally driving the shaft 3;

The other end in the length direction of the curved tube core 1 is rotatably attached to one end of a telescoping shaft 6 through a connecting portion 5, and the other end of the telescopic shaft 6 is rotatably attached to a shaft 8 through a connecting portion 7. installed on. The shaft 8 is positioned in the thrust direction by appropriate means and supported by a bearing 9. The length of the telescopic shaft 6 can be changed by an air cylinder structure, and the length of the telescopic shaft 6 can be changed.
An air port 10 that passes through the shaft 8 and communicates with the telescopic shaft 6 is provided at the end on the side of the bearing 9 .

A turning direction selection device 11 is provided near the connecting portion 7 . That is, by expanding and contracting the telescopic shaft 6, the curved tube core metal 1 turns around the connecting portion 2, but this turning direction selection device 11
are provided so that the vehicle can easily pass through the dead center when turning. Here, reference numeral 12 denotes a swinging arm disposed within the turning plane of the curved pipe cored metal 1, the center of which is a pin 13 located on the shaft 8 side of the connecting portion 7.
It is said to be able to swing freely around it. Swing arm 12
A pair of switching bars 15A and 15B arranged parallel to the shaft 8 are connected to one end 14A and the other end 14B, and a telescopic shaft 6 separate from the connecting portion 7
A pair of tension springs 16A, 16B connected to the section
are connected.

Reference numeral 17 denotes a roving, which is wound around the curved tube core metal 1 after passing through a resin bath 18. Further, the resin bath 18 is configured to be movable along the guide 19 in the length direction of the curved tube core metal 1.

The connecting portion 2 has a universal joint structure so that only rotational force can be transmitted, that is, so as not to swing the curved pipe core 1 around the central axis of the shaft 3, and is capable of turning as described above. A structure is adopted.

In such a configuration, when forming a bent pipe, first push the switching bar 15A connected to one end 14A of the swinging arm 12, and press the switching bar 15B connected to the other end 14B of the swing arm 12, as shown in FIG. While pulling, extend the telescopic shaft 6. Then, the telescopic shaft 6 is pulled by the tension spring 16B, so that the connecting portion 5 is tilted toward the guide 19, and the central axis at one end of the curved tube core 1 comes into contact with the rotating shaft.

Then, as shown in the figure, the curved tube core metal 1 is rotated, and the roving 17 is started to be wound from one end side of the curved tube core metal 1.

Next, when the telescopic shaft 6 is gradually retracted, the curved tube core metal 1 turns around the connecting portion 2 while rotating, as shown by the imaginary line in FIG. As a result, the contact position between the central axis of the curved tube core 1 and the rotating shaft gradually moves from one end of the curved tube core 1 toward the other end, so the resin bath 18 is moved to the guide 1 in the same way.
9. Then, roving 17
The winding surface can always be kept perpendicular to the axial tangent of the curved tube core metal 1 at the winding position, making it possible to perform good winding.

Before the dead center of the rotation, that is, before the total length of the telescopic shaft 6 becomes the minimum, the rotation direction selection device 11 is switched to the opposite side as shown in FIG. As a result, the telescopic shaft 6
Since it is pulled by the tension spring 16A on the opposite side, the dead center can be easily passed through. After passing through the dead center, by extending the telescopic shaft 6 again, the bent pipe core metal 1 is subsequently turned in a predetermined direction.

3 and 4 show other embodiments of the present invention. In this example, a pivot shaft 20 whose overall length does not change is used in place of the above-mentioned telescopic shaft 6, and the shaft 8 is configured to be able to reciprocate in its length direction together with the pivot direction selection device 11. With such a structure, the curved tube core metal 1 can be turned by reciprocating the shaft 8 in its length direction. Other operations are similar to those shown in FIGS. 1 and 2.

Effects of the Invention As described above, according to the present invention, the curved pipe core can be simply turned without moving it in its length direction, and the shaft body can be turned in order to turn the core. With a simple device configuration that only requires the following steps, the winding surface of the roving can always be perpendicular to the axial tangent of the core metal at the winding position.
Further, although the device includes a curved tube core and a shaft body that are connected to each other, a turning direction selection device is provided that includes a pair of springs and a means for selectively applying a biasing force to one of the springs. Therefore, by appropriately switching this turning direction selection device, passing through the dead center can be ensured.

[Brief explanation of the drawing]

1 and 2 are views showing one embodiment of the present invention, and FIGS. 3 and 4 are views showing other embodiments of the present invention. DESCRIPTION OF SYMBOLS 1...Bent pipe core metal, 2...Connection part, 6...Extendable shaft, 11...Turning direction selection device, 17...Roving.

Claims (1)

[Claims] 1. A curved pipe core that is rotatable around an axis is configured to be able to pivot around one longitudinal end of the curved pipe core, and one end of the shaft is pivotably connected to the other end of the curved pipe core, and , the other end of this shaft is configured to be able to pivot around a point spaced apart from the curved pipe core metal,
The core metal can be rotated by rotating the shaft, and the shaft is provided with a rotation direction selection device, and the rotation direction selection device selects the first direction and the first direction. and a means for selectively applying a biasing force to one of the springs. Characteristic molding equipment for resin bent pipes.