JPS649886B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tightening roller device, and more particularly to a tightening roller device for tightening formed circular pipes having a circular cross section and welded joints.

A widely known technique is to form a tape-shaped hoop material into a circular cross section while feeding it in the longitudinal direction, and to weld the joint extending in the longitudinal direction using a welding torch 2, as shown in FIG. Moreover, if the material is thin, has high thermal conductivity, and is highly elastic, such as thin stainless steel, the weld seam 4, which is the joint of the circular pipe 1, will expand downstream of the welding position due to its elasticity. To prevent this, a pair of so-called squeeze rollers 3, 3 are used to hold and stabilize the circular tube from both sides. However, in the case of a thin material with high thermal conductivity, the position of the squeeze roller becomes red-hot due to welding heat, so it has the disadvantage that it tends to sag downward and become deformed.

The present invention was made in order to eliminate such conventional drawbacks, and provides a novel tightening roller device that can fix the welded joint of a formed circular pipe while preventing its deformation. .

In FIGS. 2 and 3, the main body 10 has two
A plurality of block bodies 9, 7 are slidably provided, each of which has a tensioning roller, generally designated 3, mounted via a bearing 35, as shown more clearly in FIG. It is rotatably provided.

The tightening roller 3, as clearly shown in FIG.
A main body 32 having a thin hollow cylindrical shape and having a hollow shaft portion 32A extending at its central axis position, and a disk-shaped cover 31 that is placed over the hollow portion 34 to seal it.
It consists of a ring-shaped circumferential groove body 33 attached around the main body 32, and a cooling pipe 36 for supplying a cooling medium such as water is inserted coaxially into the hollow shaft part 32A. There is. Furthermore, 39
is a hose connection portion communicating with the cooling pipe 36.

The configuration of the circumferential groove body 33 of this tightening roller 3 is
This will be explained in more detail with reference to FIG. 3 and FIG. Diameter D ₂ of the upper peripheral edge 33A of the circumferential groove body 33
is formed to be smaller than the diameter D ₁ of the lower peripheral edge portion 33B, and the value of the difference D ₁ −D ₂ is determined by placing the lower peripheral edge portions 33B of both tightening rollers 3, 3 in close contact with each other, as shown in FIG. Both tightening rollers 3 when
The width is equal to the width of the gap 37 between the two.
However, when both the tightening rollers 3, 3 of the lever are arranged in the above state, their circumferential grooves 33 define a passage with a circular cross section surrounding the circular pipe 1, as clearly shown in FIG. I will do it. The lower portion of the passage having a circular cross section of the lever is closed by the contact portion 38 of the lower peripheral edge portion 33B, and a gap 37 is similarly provided above the passage. This abutment part 38 prevents the red-hot circular tube 1 from hanging downward and deforms, and also prevents the upper gap 37
This facilitates the passage of the circular tube 1 through the weld seam 4.

Next, the moving device 5 for the tightening rollers 3, 3 will be explained. A feed screw shaft 53A is screwed into one of the block bodies 6 and 7 on which the tightening rollers 3 and 3 are rotatably supported at a threaded engagement portion 61, and another feed screw shaft 54 is screwed into one block body 6 at a screw engagement portion 61.
A passes through the hole 62. Further, another feed screw shaft 54A parallel to the feed screw shaft 53A is threadedly engaged with the other block body 7 at a screw engaging portion 71, and the feed screw shaft 53A passes through the hole 72. These parallel feed screw shafts 53A, 5
A guide shaft 52A is provided between the blocks 4A and parallel thereto, and this guide shaft 52A passes through both the blocks 6 and 7 so as to be able to slide relative to each other.
What should be noted is that the threaded engagement portion 61 and the threaded engagement portion 71 have a reverse thread relationship with each other.

One end 52B of the guide shaft 52A is formed into a prismatic shape, into which the main gear 52 is fitted.
A handle 51 for rotating 2 is attached. Gears 53 and 54 are fixed to one ends of the feed screw shafts 53A and 54A, respectively, and these gears 53 and 54 mesh with the main gear 52 fitted into the prismatic shaft portion 52B.
When rotating, both gears 53 and 54 rotate in the same direction, opposite to this rotation direction. Furthermore, when pulling out the main gear 52 from the prismatic shaft portion 52B and fitting it into the prismatic shaft portions 53B and 54B protruding from the respective ends of the feed screw shafts 53A and 54A, only the fitted shafts are individually removed. It can be rotated to

Next, the operation of this roller moving device 5 will be explained. The main shaft 52 is guided by the prismatic shaft portion 52B of the shaft 52A.
When the handle 51 is rotated in the fitted state (as shown), the main gear 52 rotates, and the gears 53 and 54 rotate in the same direction. Therefore, the feed screw shafts 53A and 54A also rotate in the same direction. Rotate in the direction. However, since the threaded engagement parts 61 and 71 have a reverse thread relationship, the blocks 6 and 7, that is, the tightening rollers 3 and 3, cannot be moved in opposite directions, that is, in the direction toward each other or in the direction away from each other. can. For adjustment, adjust the position of one tightening roller 3 individually so that the weld seam 4 of the circular tube 1 is located approximately in the center of the gap 37 between both tightening rollers 3, 3, and then adjust the position of the other tightening roller 3. The main gear 52 may be individually adjusted so as to make contact with this at the contact portion 38, and then the main gear 52 may be fitted into the prismatic shaft portion 52B. When introducing the circular tube 1, the distance between the two tightening rollers 3, 3 can be adjusted to open or close by turning this handle 51.
Note that 8 is a fixing screw that fixes the guide shaft 52A and therefore the main gear 52.

As detailed above, according to the present invention, the lower peripheral edges of the circumferential groove bodies collide with each other, and the upper peripheral edges are open with a gap, so that the sagging deformation of the formed and welded circular pipe is prevented. (ii) Since the cooling medium circulates, sufficient tightening and fixing can be achieved through the tightening rollers, and cooling can be achieved, etc. There is an effect. The use of the roller moving device has the effect of (iii) making it extremely easy to adjust the position of both tightening rollers and to move them closer to each other and away from each other.

[Brief explanation of drawings]

Fig. 1 is a simplified perspective view showing the operating principle of the tightening roller of the present invention, Fig. 2 is a front view of an embodiment of the invention, Fig. 3 is a plan view, and Fig. 4 is a side sectional view. It is. 10... Main body, 1... Circular pipe, 3, 3... Tightening roller,
4... Welding seam, 33A... Upper peripheral edge, 33B...
Lower peripheral edge, 37... gap, 34... hollow part.

Claims (1)

[Claims] 1. A pair of blocks provided on the main body 10 in a slidable manner and adjustable in the direction toward or away from each other by two feed screw shafts 53A, 54A having opposite threads. The hollow rollers 3, 3 are formed such that the diameter D ₂ of the upper peripheral edge 33A is smaller than the diameter D ₁ of the lower peripheral edge 33B by the width of the desired gap 37 (D ₁ -D ₂ ). A cooling device 36 is provided in communication with the hollow portion 34 to circulate a cooling medium, and gears 53 and 54 are fixed to the ends of the feed screw shafts 53A and 54A, respectively. A prismatic shaft portion 53 that protrudes
B, 54B, the main gear 52 to which the handle 51 is attached can be fitted onto the prismatic shaft portion 52B and meshed with the gears 53, 54,
A tightening roller device characterized in that it can be individually fitted onto the prismatic shaft portions 53B and 54B, and the feed screw shaft can be rotated simultaneously or individually by the handle.