JPH0670983U - Cylindrical plate holding device - Google Patents

Abstract

(57) [Abstract] [Purpose] To accurately maintain the distance between two facing sides of a thin plate bent in a cylindrical shape. [Configuration] By moving the center block 24 in the axial direction, the tapered surfaces 21 to
Since the shell blocks 13 to 15 are expanded and contracted by being pressed by 23, the plate 1 bent into a cylindrical shape is reliably held between the inner peripheral shell blocks 12 to 15 and the outer peripheral pressing blocks 2 to 6. To be done.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cylindrical plate holding device.

[0002]

[Prior art]

 Vehicles such as buses and trucks are generally equipped with an air tank in order to store air used as a drive source for brakes and doors.

The air tank is normally bent by bending a metal plate into a cylindrical shape using a roller or the like, and pressing several positions on the outer circumference of the cylindrically bent plate with a pressing block to face each other by bending. After the two sides are accurately held at a predetermined interval, the two sides are welded to form a cylindrical body, and end plates are welded and fixed to both ends of the cylindrical body.

[0004]

[Problems to be solved by the device]

 However, the conventional air tank manufacturing method described above has the following problems.

That is, when the plate bent into a cylindrical shape has a large thickness, the plate itself is retained by the rigidity of the plate itself only by pressing the outer periphery of the plate with the pressing block. If a thin high-strength steel plate is used to reduce the weight of the vehicle, it will not be possible to maintain the shape of the plate during welding simply by pressing the outer circumference with a pressing block.

[0006] Therefore, when a thin plate is used, the gap between the abutting portions of the two sides cannot be accurately maintained at a predetermined gap, so that the quality of welding deteriorates and a high pressure that complies with the specifications of the high-pressure container is obtained. There was a problem that a quality air tank could not be manufactured.

In view of the above situation, the present invention aims to provide a cylindrical plate holding device capable of accurately holding the distance between two facing sides of a thin plate bent in a cylindrical shape. It is what

[0008]

[Means for Solving the Problems]

 The present invention provides a plurality of holding blocks for holding the outer circumference of a plate bent in a cylindrical shape in the circumferential direction, and extends in the axial direction of the plate bent in a cylindrical shape, and the inner circumference of the plate corresponding to the holding block. A plurality of shell blocks that hold down a plurality of shell blocks are provided in the circumferential direction, and a rod-shaped center block having a surface opposite to the surface of each shell block opposite to the plate is provided at the center position of the plurality of shell blocks. A taper that is provided so as to be movable in the axial direction and that approaches the peripheral surface of the plate as it goes from the one end side to the other end side in the axial direction on the surface facing the center block of the shell block except all or one. In addition to forming a surface, a taper surface parallel to the taper surface of the shell block is formed on a surface of the center block that faces the taper surface of the shell block. Those relating to the cylinder plate holding device.

[0009]

[Action]

 The operation of the present invention is as follows.

By moving the center block in the axial direction, the shell block is expanded and contracted by being pushed by the taper surface of the center block, so that the cylindrical block is provided between the inner peripheral shell block and the outer peripheral pressing block. The bent plate is held securely.

[0011]

【Example】

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

1 to 3 show an embodiment of the present invention.

In the figure, 1 is a plate bent into a cylindrical shape by a roller or the like (not shown), 2 to 6 are presser blocks provided in plural in the outer circumferential direction 7 of the plate 1, and 8 are presser blocks 2 to 6. Is a pressing surface having an arc shape, and 9 is a pressing device such as an air cylinder connected to each of the pressing blocks 2 to 6.

A shell block 12 that extends in the axial direction 10 of the plate 1 bent into a cylindrical shape and presses the inner circumference of the plate 1 by the pressing surfaces 11 corresponding to the pressing surfaces 8 of the pressing blocks 2 to 6. To 15 are provided in the circumferential direction 7 and face the surfaces 16 to 19 formed at the center positions of the shell blocks 12 to 15 on the side opposite to the plate 1 of each shell block 12 to 15. A rod-shaped center block 24 having surfaces 20 to 23 is inserted and arranged, and a parallel portion 25 at the rear end of the center block 24 is inserted and supported in a guide hole 27 formed in a stand 26 so as to be movable in the axial direction 10. Between the stand 26 and the rear end of the center block 24, an expansion / contraction device 29 such as an air cylinder that is extendable / contractible in the axial direction 10 is connected via a bracket 28.

All or the surfaces 17 to 19 of the shell blocks 13 to 15 that face the center block 24 except one, which serves as a position reference, move toward the other end side from the one end side in the axial direction 10 described above. The taper surfaces of the center block 24 facing the taper surfaces 17-19 of the shell blocks 13-15 are the taper surfaces 17-19 of the shell blocks 12-15. The guide rails 31 are fixed to the guide grooves 30 formed on the respective surfaces 20 to 23 of the center block 24 and extending from the one end side to the other end side, and the taper surfaces are parallel to each other. A guide bearing 32 that moves along the guide rail 31 is fixed to 20 to 23 to 19.

Further, a guide member 34 extending in the radial direction 33 of the plate 1 is projectingly provided on the other end side of each shell block 12 to 15, and the guide member 34 is attached to a stand 26, such as a ball plunger type guide. By the holding device 35, it is held so as to be movable in the radial direction 33 and immovable in the axial direction 10.

Incidentally, 36 is a welding torch arranged at the abutting portion of the plate 1, 37 is a welding bead, and 38 is a bolt.

Next, the operation will be described.

When manufacturing an air tank for vehicles such as buses and trucks, first, a thin metal plate 1 is bent into a cylindrical shape by using a roller or the like (not shown), and the bent plate is then formed into a cylindrical shape. While holding the positions of the outer periphery of 1 at several positions with the pressing blocks 2 to 6, the shell blocks 12 to 15 are inserted and arranged on the inner periphery of the plate 1, and the expansion / contraction device 29 such as an air cylinder is expanded / contracted to move the center block 24. Move in the axial direction 10.

Then, the other shell blocks 13 to 15 excluding the one shell block 12 serving as the position reference are movable in the radial direction 33 by the holding device 35 such as a ball plunger type guide and the axial direction 10 is also increased. Since the taper center block 24 is moved by the expansion / contraction device 29, it is moved outward in the radial direction 33 of the plate 1 bent into a cylindrical shape, and the shell blocks 12 to 15 as a whole are held. Is expanded.

With this, between the pressing blocks 2 to 6 on the outer circumference of the plate 1 and the shell blocks 12 to 15 on the inner circumference, several positions in the circumferential direction 7 of the plate 1 are pressed, so that it is light. Even if the plate 1 is made thin for the purpose of quantification, the shape of the plate 1 is maintained during welding, and thus the gap between the two opposed sides of the cylindrically bent plate 1 is accurately maintained at a predetermined gap. As a result, high-quality welding can be performed, and it is possible to manufacture an air tank that conforms to the standards for high-pressure vessels.

After the welding of the butt portion of the plate 1 is completed, the cylindrical cylinder formed by welding is removed from the holding blocks 2 to 6 and the shell blocks 12 to 15 by the procedure reverse to the above, and both ends of the cylindrical cylinder are removed. Weld and fix the end plate to complete the air tank.

Further, according to the present invention, by adjusting the extension amount of the expansion / contraction device 29, it can be widely used for plates 1 having different bending diameters.

Further, the expansion / contraction device 29 may be provided with a moving amount fine adjusting device such as a screw type.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0026]

[Effect of device]

 As described above, according to the cylindrical plate holding device of the present invention, it is possible to obtain an excellent effect that the interval between two facing sides of a thin plate bent in a cylindrical shape can be accurately held. .

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of an embodiment of the present invention.

FIG. 2 is a schematic view seen from a II-II direction in FIG.

FIG. 3 is a schematic exploded view of a shell block.

[Explanation of symbols]

 1 plate 2 to 6 presser block 7 circumferential direction 10 axial direction 12 to 15 shell block 16 to 23 surface 24 center block

Claims (1)

[Scope of utility model registration request] 1. A plurality of presser blocks for pressing the outer circumference of a plate bent in a cylindrical shape are provided in the circumferential direction, and extend in the axial direction of the plate bent in a cylindrical shape so as to correspond to the inside of the presser block. A plurality of shell blocks that hold down the circumference are provided in the circumferential direction, and a rod-shaped center block having a surface facing the surface formed on the side opposite to the plate of each shell block is provided at the center position of the plurality of shell blocks. A taper surface that is provided so as to be movable in the axial direction and that faces the center block of the shell block except all or one is closer to the peripheral surface of the plate as going from the one end side to the other end side in the axial direction. A cylinder characterized by forming a tapered surface parallel to the tapered surface of the shell block on the surface of the center block facing the tapered surface of the shell block. Plate holding device.