JPS60414B2 - Steel pipe end clamping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamp device that clamps the end of a steel pipe and holds the steel pipe in a predetermined position when the steel pipe is disposed of.

Typical methods of quenching steel pipes include the external quenching method using a ring nozzle, the internal quenching method in which cooling water is pumped into the interior from the end face of the steel pipe, and the internal and external quenching method in which the steel pipe is placed in a water tank and cooling water is pumped into the interior from the end face. There is a hardening method, and the clamping device of the present invention is effective when implemented mainly in the internally competing method and the internally and externally hardening method.

Recently, attempts have been made to incorporate a scraping device into the steel pipe production line and bring it online.For this reason, the clamping device used in the quenching device must operate at high speed, and the end face of the steel pipe must be connected to the end face of the nozzle. It can be clamped by coming into contact with the
Although it is required that the clamp be reliable and that there is no risk of the steel pipe coming off due to water supply, etc., conventional clamping devices do not necessarily satisfy these requirements.

The present invention has been made to satisfy the above-mentioned requirements, and provides a clamping device that has a simple structure, has a quick response, and can reliably clamp the end surface of a steel pipe by bringing it into contact with the end surface of a nozzle. The present invention will be explained below with reference to the drawings. FIG. 1 is a side view, partially shown in cross section, of a light fitting head using a clamping device according to the present invention, and FIG. 2 is a front view thereof.

In both figures, 1 is a hardened head, 11 is a head body,
12 is a cylindrical body rotatably disposed within the main body 11 via bearings 13, 13a. 14 is a hydraulic cylinder attached to the upper part of the main body 11, 16 is a motor, and 17 is a reducer that reduces the output of the motor, whose gear (not shown) meshes with a gear 18 fixed to the outer periphery of the cylindrical body 12. There is.

Reference numeral 19 denotes a nozzle fixed to the tip of the cylindrical body 12, which can be replaced depending on the outer diameter of the steel pipe to be hardened.

Reference numeral 2 denotes a clamp device according to the present invention, which is provided at one end of the cylindrical body 12.

In the clamp device 2, a movable element 21 is mounted on the cylindrical body 12, and 21 is a groove provided on the outer periphery of the movable element. This movable element 20 is configured to slide in the direction of the rut on the cylindrical body 12 but not rotate by a key, a keyway, a spline, or the like. 22, 22a are ladder bars, one end of which is rotatably connected to the main body 1 by shafts 23, 23a, and the end of which is connected to the operating bar 15 of the hydraulic cylinder 14 through a shaft 24b.

The pins 24, 24a are fitted into the grooves 21 of the movable element 20 with pins protruding from the inner sides of the intermediate portions of the lever bars 22, 22a.

Reference numerals 25, 25a, and 25b are approximately L-shaped clamp arms each having one end fixed to a movable element 2.
One end of each lever 27, 27a, 27b is connected to the cylindrical body 12, and the other end of the lever 27, 27a, 27b is connected to approximately the center of each of the levers 5, 25a, 25b.

26, 26a, 26b are clamp arms 25, 25a, 25
It is a clamp shoe attached to the tip of the pipe P, and has a protrusion 26 on one end for clamping the nozzle 19, and can be replaced according to the outer diameter of the steel pipe P.

Note that although the figure shows a case where three clamp arms 25, 25a, and 25b are provided at equal intervals on the movable element 20, the present invention is not limited to this, and any number of clamp arms 25, 25a, 25b may be provided as long as there are two or more. . The operation of the embodiment of the present invention constructed as described above will be explained as follows.

The steel pipe P fed from the previous process is aligned with the quenching head and applied to the end face of the nozzle 19. At this time, as shown in FIG. 3, the operating stroke 15 of the hydraulic cylinder 14 advances,
The levers 22, 22a are rotated clockwise about the shafts 23, 23a, and the movable element 20 is advanced via the pins 24, 24a. When the movable element 20 moves forward, the clamp arm 25
, 25a, 25b rotate inward under the control of a lever 27 whose one end is connected to the cylindrical body 12, and clamp the steel pipe P and nozzle 19 through the clamp shoes 26, 26a, 26M. In addition, when the outer diameter of the steel pipe P is different, replace the clamp shoes 26, 26a, 26b attached to the tips of the clamp arms 25, 25a, 25b with ones corresponding to the outer diameter of the steel pipe P, and also replace the nozzle 19. . In this state, cooling water is sent into the steel pipe P from the water pipe 5, and the steel pipe P is rotated by the motor 16 via the cylindrical body 12.

When the cylindrical body 12 rotates, the movable element 20 connected by a key or the like moves to the levers 22, 22 which are pivotally supported on the body 11.
The clamp arm 25 rotates along the pins 24, 24a of
, 25a, 25b are rotated to uniformly cool the inner surface of the steel pipe P. In addition, steel pipe P
In addition to cooling the inner surface of the steel pipe P, the outer surface of the steel pipe P may be cooled by a cooling device (not shown). When the steel pipe P is cooled for a predetermined period of time, the valve 31 is closed to stop water supply and at the same time, the rotation of the cylindrical body 11 is stopped. At this time, by supplying air into the cylindrical body 12, it is possible to prevent the inside of the cylindrical body 12 from becoming vacuumed and being destroyed due to the discontinuation of water supply. When the rotation of the cylindrical body 12 stops, the operating rod 15 of the hydraulic cylinder 14 is retracted, the movable element 20 is retracted, and each clamp arm 25, 25a, 25b is rotated outward to release the clamp. In the above description, a case has been described in which the clamp mechanism 2 is operated by the hydraulic cylinder 14, but a motor or other drive device may also be used.

Although other mechanisms have been described with reference to the illustrated embodiments, the present invention is not limited thereto, and other mechanisms may be used as long as they provide similar functions and effects. As is clear from the above explanation, the clamping device according to the present invention has a long response and can reliably and strongly clamp the end face of the steel pipe to be hardened against the end face of the nozzle, so it is implemented in a steel pipe hardening equipment. The effect is remarkable.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a dawn head equipped with a clamping device according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is an explanatory view of the operation. 1: Competitive head, 11: Main body, 12: Cylindrical body, 14: Hydraulic cylinder, 19: Nozzle, 2: Clamp device, 20:
Movable element, 21: Book, 22, 22a: Lever, 23, 2
3a: shaft, 24, 24a: pin, 25, 25a, 25b
: Clamp arm, 26, 26a, 26b: Clamp shoe, 27, 27a, 27b: Lever. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A cylindrical body through which cooling water passes, a movable element fitted to the cylindrical body so as to slide in the axial direction, and a lever pivotally supported by the movable element and having one end pivotally supported by the cylindrical body. It consists of a plurality of clamp arms whose ends are connected, and a mechanism for sliding the movable element along the cylindrical body, and the mechanism allows the movable element to move a steel pipe aligned with the end surface of the nozzle attached to the cylindrical body. A clamping device for the end of a steel pipe, which is characterized by sliding and clamping.