JPS6316606B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a band joint device suitable for connecting pipes to pipes, pipes to valves, pumps, pressure cookers, stirrers, etc. and their lids, and any other cylindrical bodies. Regarding.

Conventionally, flange bolt tightening methods, clamp band methods, etc. have been used to connect the cylinders, but these methods take time to attach and detach, and if they are designed to be quickly attached or detached, they may cause problems. There are problems such as insufficient surface pressure necessary for crimping between the abutting end surfaces of the connecting cylinders.

The present invention was developed in view of these problems, and its purpose is to be able to quickly and reliably perform attachment/detachment operations, to obtain sufficient surface pressure between the cylinders to be connected, and to be suitable for mass production. It is an object of the present invention to provide a band joint device that can be obtained at low cost.

In the band joint device according to the present invention, an annular bulge is formed on the outer surface of the cylinders along the abutting end surfaces of a pair of cylinders to be connected having annular crimp butt end surfaces, and a composite outer surface of the annular bulge of both cylinders is provided. has a cross section that forms an arc having its center at the crimp butt end surface, and has an inner surface that is in close contact with the composite outer surface of the annular bulge and extends almost all around the annular bulge. A plurality of bondage band pieces are provided to touch and bind the bondage band pieces, and at both ends of each bondage band piece, there is a half-cone-shaped protrusion in the shape of a hollow truncated cone divided into two along a plane including the vertical axis. are fixedly installed, and the adjacent half-cone-like protrusions are butted together to form a single hollow truncated cone, and the butted adjacent half-cone-like protrusions are A truncated cone integrally formed with the proximal end of the tightening bolt is inserted into the inner side in a state of surface contact, and the tip of the tightening bolt is protruded from the opening of the truncated end of the abutted half-conical projection. A tightening nut having a tightening part at its base having a conical inner surface in surface contact with the outer surface of the adjacent half-conical protrusion is screwed onto the tip of the tightening bolt and tightened, and the annular bulge is tightened with a tightening band piece. Consists of bondage.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, P1 and P2 are a pair of cylinders to be connected to each other. These include pipes and pipes, pipes and valves, pumps, pressure cookers, stirrers, etc., and their lids. In the illustrated example, the cylindrical bodies P1 and P2 constitute a casing of a stirrer, and have a rotating shaft 2 of a stirring blade inside. This rotating shaft 2 is inserted into a bearing 4 of an end plate 3 of one cylindrical body P2.

Both cylindrical bodies P1 and P2 are abutted at an abutting end surface 5, and have annular bulges F1 and F2 on the outside along this abutting end surface 5, respectively.
Both annular bulges F1 and F2 form a synthetic outer surface 6 having an arcuate cross section when they are butted against each other. The circular arc of the composite outer surface 6 is a circular arc having a radius R1 centered at a point O on the abutting end face 5. Both cylindrical bodies P1 and P2 have opposing annular grooves on their abutting end surfaces, into which the packing 8 is fitted.

Around the outer surface 6 of the annular bulges F1 and F2,
A tightening band piece 9 is provided almost all around the circumference. As shown in FIG. 2, a plurality of tightening band pieces 9 (three in the illustrated case) are provided, and each tightening band piece
The inner surface 10 has a cross-sectional shape constituted by an arc of radius R centered on point O so as to be in close contact with the composite outer surface 6 of the annular bulges F1 and F2.

Half cone-shaped protrusions 12, 12 each having a shape obtained by dividing a hollow truncated cone into two along a plane including the vertical axis are fixed to both ends of each tightening band piece 9 by welding or the like. Adjacent half-cone shaped protrusions 12, 12
As shown in FIGS. 3 and 4 (showing the protrusions 12, 12 closer together than in FIG. 3), a single hollow truncated cone is formed when the two are butted together. The opening 13 is formed by cutting off the top of the cone.

As shown in FIG. 5, a truncated cone body 16 integrally formed at the base end of the tightening bolt 15 is inside the hollow cone formed by abutting adjacent half cone-like protrusions 12. is inserted. truncated cone 1
A groove 17 is formed in the bottom surface of 6 as shown in FIG. The cross-sectional shape of this groove 17 has a radius R2 constituting the cross-sectional shape of the outer surface of the tightening band piece 9.
(FIG. 5), and the surface of the groove 17 has a shape that allows it to come into close contact with the outer surface of the tightening band piece 9. The tip of the tightening bolt 15 projects from the opening 13 of the half-conical projection 12, and a tightening nut 18 is screwed into the projecting end. The tightening nut 18 has a conical inner surface 19, as can be seen in FIGS. 5 and 6.
It is integrally provided with a tightening part 20 having a. The conical inner surface 19 has an adjacent half-cone shaped protrusion 12
It has a shape that closely contacts the outer surface of the cone formed by combining the two.

The band joint device described above is in the state shown in FIG. 5 before being tightened. In this state, the tightening band piece 9 does not exert a tightening action on the annular bulges F1 and F2 of the connected cylinder, and both annular bulges F
1 and F2 are mutually separable.

When the tightening band piece 9 is placed on the outer surface 6 of both annular bulges F1 and F2 and the tightening nut 18 is tightened, the inner surface 19 of the tightening portion 20 comes into contact with the entire outer surface of the adjacent half-cone-shaped protrusion 12, The state shown in FIG. 7 is obtained. In this state, the conical surface of the truncated cone 16 of the tightening bolt 15 is pressed against the inner surface 19, and the half-cone shaped protrusion 12 is pressed between the inner surface of the tightening portion 20 and the outer surface of the truncated cone 16. Therefore, the adjacent half-cone-like protrusions 12 are drawn together, and the tightening band piece 9, which had a gap N as shown in FIG. 3 before tightening, becomes as shown in FIG. 4. It is tightened to the annular bulges F1 and F2 so that there is a gap N' (for example, about 2 mm) between them.

In this tightened state, the tightening force of the tightening band piece 9 is applied evenly to the entire circumference of both the annular bulges F1 and F2 due to the force acting in the radial direction by the tightening bolt 15, and the inner surface of the tightening band piece 9 Since the outer surfaces of both the annular bulges have an arcuate cross-sectional shape, not only the binding force directed inward to the cylinders P1 and P2 but also the direction in which the annular bulges F1 and F2 are abutted against each other and pressed together at the end surface 5. The bondage force also acts. Therefore, when there is a rotating shaft 2 as shown in the figure, the bearing 4 thereof also maintains an accurate right angle to the rotating shaft, and the stirring blade supported on the rotating shaft also takes the correct position.

On the other hand, when the concave groove 17 is formed at the bottom of the truncated cone 16 of the tightening bolt 15, the concave groove 17 is in close contact with the outer surface of the tightening band piece 9 having an arcuate cross section, so that the tightening bolt It is impossible for the nut 15 to rotate, so the nut 18 will not loosen. In this way, the concave grooves 17 of the truncated conical bodies 16 closely contact the adjacent tightening band pieces 9, especially the joint portions, and press them radially inward, thereby causing the ends of the adjacent tightening bands to have a radial shape. Compared to the conventional case where flanges projecting outward in the direction are provided and a tightening force is exerted on the tightening band by tightening bolts passing through these flanges, a uniform surface pressure can be obtained over the entire circumference of the tightening band.

To release this band joint device, tighten nut 1
Just relax 8. As a result, the state shown in FIG. 5 is obtained, and the tightening band piece 9 can be removed from the annular bulges F1 and F2 without completely removing the nut 18.

As described above, the band joint device of the present invention differs in principle and structure from the conventional clamp band type joint device, and requires 1/2 to 3 times less material than the conventional flange bolt tightening type joint device.
Although the structure is simple and inexpensive, sufficient binding and sealing effects can be obtained, and attachment/detachment operations are quick and easy. Also,
Since the tightening force acts on the tightening band piece as a radial force by the tightening bolt, a uniform surface pressure acts on the entire surface of the tightening band.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the main parts of the band joint device of the present invention, Fig. 2 is a plan view mainly showing the tightening band piece, Fig. 3 is a side view of the tightening band piece, and Fig. 4 is a side view of the tightening band piece. FIG. 5 is a sectional view showing the state of the tightening bolt and tightening nut before tightening; FIG. 6 is a perspective view of the tightening bolt and tightening nut; FIG. 7 FIG. 2 is a cross-sectional view showing a state in which the tightening bolt and the tightening nut are tightened. P1, P2...Cylinder to be connected, F1, F2...Annular bulge, 5...Abutting end face, 6...Synthetic outer surface of the annular bulge, 9...Tightening band piece, 12...Half cone Body-like projection, 13... opening, 15... tightening bolt, 16... truncated cone, 17... concave groove thereof,
18...Tightening nut, 19...Conical inner surface, 20
...Tightening section.

Claims (1)

[Claims] 1. An annular bulge is formed on the outer surface of the cylinders along the abutting end surfaces of a pair of connected cylinders having annular crimped butt end surfaces, and the combined outer surface of the annular bulges of both cylinders is , whose cross section forms an arc having a center at the crimped butt end surface, and has an inner surface in close contact with the synthetic outer surface of the annular bulge and extends almost all around the annular bulge. A plurality of bondage band pieces are provided to touch and bind the bondage band pieces, and at both ends of each bondage band piece, a half-cone-shaped protrusion in the shape of a hollow truncated cone divided into two along a plane including the vertical axis is provided. The adjacent half-cone-like protrusions are formed into a single hollow truncated cone by abutting against each other, and the inner sides of the abutted adjacent half-cone-like protrusions are In this method, a truncated cone integrally formed at the base end of the tightening bolt is inserted in a state of surface contact, and the tip of the tightening bolt is made to protrude from the truncated opening of the abutted half-conical protrusion. A tightening nut, which has a tightening part at its base that has a conical inner surface in surface contact with the outer surface of the adjacent half-conical protrusion, is screwed onto the tip of the tightening bolt and tightened, and the annular bulge is secured with a tightening band piece. Band joint device for bondage. 2. Claims in which a concave groove with an arcuate cross-section is formed on the bottom surface of the truncated cone of the tightening bolt, and is in close contact with the outer surface of the tightening band piece, which has an arcuate cross-section. The band joint device according to item 1.