JPH0118126B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamping device used during hardening of steel pipes.

There are several methods for hardening steel pipes, such as an outer surface cooling method using a ring nozzle, an inner surface quenching method that pumps cooling water to the inner surface, and an inner and outer surface quenching method that cools the outer surface and pumps cooling water to the inner surface. In these quenching methods, when cooling water is injected or pumped onto the outer or inner surface or inner and outer surfaces of the steel pipe fed onto the quenching bed, the steel pipe sways or bends. For this reason, a conventional clamping mechanism in which two clamp rolls were arranged parallel to the axial direction of the steel pipe was installed at several locations facing the receiving roll provided on the quenching bed. It is clamped in between to prevent it from shaking or bending.

By the way, as is well known, there are dozens of different outside diameters of steel pipes to be hardened, ranging from about 20 mm to more than 400 mm. Adjusting the gap between However, the mechanism that moves the clamp mechanism up and down is large and complicated, and the operation is troublesome.Furthermore, the same clamp rolls are used for large-diameter steel pipes as for small-diameter steel pipes, making it difficult to clamp them and ensuring reliable clamping. It was difficult.

The present invention has been made to solve the above-mentioned conventional problems, and provides a clamping device that can easily and reliably clamp steel pipes of various outside diameters using a simple mechanism. The present invention will be explained below with reference to the drawings.

FIG. 1 is a plan view of an example of a hardening device using the clamp device of the present invention, and FIG. 2 is a side view thereof. In both figures, 1 is a quenching bed, where multiple units are installed in parallel and can quench multiple steel pipes at the same time. 2 is a quenching head provided on the quenching bed 1, and one end thereof is connected to a water pipe 21 connected to a water source (not shown).
A nozzle 22 is provided at the other end. 3 is a holding device that holds the steel pipe P whose tip is in contact with the nozzle 22 in that position. Reference numeral 4 denotes a receiving roll, and a base 4 is placed transversely on the quenching bed 1 at predetermined intervals.
1 via a bearing 42. Reference numeral 5 designates a clamp mechanism disposed close to each receiving roll 4, the details of which are shown in FIGS. 3 and 4.

FIG. 3 is a side view of the embodiment of the present invention, and FIG. 4 is a front view thereof. 11 is a base provided on the hardening bed 1;
Reference numeral 12 denotes a support plate provided across the base 11, and a guide hole 13 is provided in the length direction of the support plate.
Reference numerals 51 and 51a are movable members that are fitted and supported in the guide holes 13 of the support plate 12, and the arms 52 and 52a are held by rotatable fixing means.
Clamp rolls 54, 54a are attached via. The clamp rolls 54, 54a are formed in the shape of a truncated cone, and are attached to the support members 53, 53a with their large diameter portions facing upward (hereinafter referred to as an inverted truncated cone shape). 55 is a rod, one end of which is connected to the operating rod of a hydraulic cylinder (not shown), and shafts 56 are fixed at intervals corresponding to the intervals of the clamp mechanisms 5. 57, 57a are movable arms, one end of which is rotatably fixed to a shaft 56 fixed to the rod 55, and the other end rotatably attached to the lower end of the movable members 51, 51a.

FIG. 5 is an explanatory diagram of the functions of the rod 55, movable arms 57, 57a, etc. Operating rod 5 of hydraulic cylinder 58
When 9 is moved forward, the rod 55 connected to this
is displaced in the direction of the arrow, and when the shaft 56 moves to the position 56', for example, the movable members 51, 51a connected to the movable arms 57, 57a move into the guide holes 13, 13.
a and is displaced to positions 51' and 51a'. As a result, the clamp rolls 54, 54a move laterally to positions 54', 54a', increasing the distance between them. This state is shown in FIG. In addition, by rotating and fixing the arms 52, 52a at appropriate positions according to the pipe diameter of the material to be quenched, the rod 5
The interval can be adjusted to minimize the working distance of 5.

The operation of the hardening device using the clamp device configured as described above will be explained as follows. First, the arms 52, 52a are rotated and fixed at the optimum position where the rod 55 can clamp the steel pipe with the shortest possible working distance according to the pipe diameter of the material to be quenched, and the interval between the clamp rolls 54, 54 is adjusted. I'll keep it. The operating rod 59 of the next hydraulic cylinder 58 is moved forward, the clamp rolls 54 and 54a are moved laterally to widen the gap between them, and the steel pipe P is sent along the receiving roll 4 to the quenching bed 1, and the end part nozzle 2
2 and held in that position by the holding device 3. Next, the operating rod 59 of the hydraulic cylinder 58 is moved backward, and each clamp roll 54, 54a is moved in the pass line direction of the steel pipe P, and the outer surface of the steel pipe P is brought into contact with the outer surface of the clamp rolls 54, 54a to be clamped. . At this time, the clamp rolls 54, 54
Adjust the clamping pressure in step (a) to the allowable surface pressure of the steel pipe (avoid making a dent in the steel pipe) in advance. The clamp rolls 54, 54a are arranged in accordance with the outer diameter of the steel pipe P. In the case of a steel pipe _P1 with a small outer diameter, the center distance _l1 approaches, and in the case of a steel pipe _P2 with a large outer diameter, the center distance _l2 moves away. (See Figure 6). In this state, cooling water is pumped from the water pipe 21 to the steel pipe P through the quenching head to cool the steel pipe P. At this time, the steel pipe P has clamp rolls 54, 54a at several places in the length direction.
Because it is clamped by a wedge-shaped gap, there is no risk of it popping out, wobbling, or bending.

When quenching is completed by pumping cooling water for a predetermined period of time,
While cutting off the cooling water and loosening the holding device 3, the clamp rolls 54 and 54a of each clamp mechanism 5 are moved to both sides to release the clamp, the steel pipe P is moved backward, and a new steel pipe is inserted again. .

In the above explanation, the clamping device of the present invention is used in a hardening device that uses an internal hardening method, but it can also be used in hardening devices that use an external hardening method or an inside and outside hardening method. Not until now. Furthermore, although we have described the case where the steel pipe is charged in the axial direction and withdrawn again in the axial direction, the steel pipe is transported laterally and charged into the quenching bed from above the clamping device, and when the quenching is completed, it is You can also take it out from there.

As is clear from the above description, the clamping device of the present invention is configured so that the clamp roll in the shape of an inverted crested cone can be moved laterally by an arbitrary distance, so that it can be widely applied to various types of steel pipes. Furthermore, since the structure is simple, the operation is easy, and the steel pipe can be reliably clamped, there is no fear that the steel pipe will sway or bend even when cooling water is injected or pumped.

[Brief explanation of drawings]

Fig. 1 is a plan view of an example of a hardening device using the clamp device of the present invention, Fig. 2 is a side view thereof, and Fig. 3
4 is a front view of the embodiment of the present invention, FIG. 5 is an explanatory diagram of the operation of the clamp roll moving mechanism, and FIG. 6 is an explanatory diagram showing the clamping state of the clamp roll. 1: Quenched floor, 12: Support plate, 13: Guide hole,
4: Receiving roll, 5: Clamping device, 51, 51
a: Movable member, 54, 54a: Clamp roll,
55: Rod, 56: Axis, 57, 57a: Movable arm.

Claims (1)

[Claims] 1. A steel pipe clamping device characterized in that clamp rolls having a conical shape with inverted crests are arranged in parallel on both sides of the pass line of the steel pipe on the quenching bed, and each of the clamp rolls is configured to be movable in the lateral direction. .