JPH0139711Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a pipe tension control device in a continuous pipe manufacturing apparatus.

In conventional equipment of this type, the welded tube was guided through an annealing furnace, pinch rolls, and then side rolls and Turk's rolls. However, when the tube is deflected in the annealing furnace, this deflection changes the rotational resistance of the pinch rolls on the downstream side of the tube in the flow direction. It controlled the rotation of the side pinch rolls. However, with this mechanism, it is difficult to perform accurate detection due to mechanical loss and differences in the circumferential speed of the pinch rolls. Additionally, since the side rolls and Turk's rolls were separated from the pinch rolls, smooth free rotation was prevented, and a brake was applied to the pinch rolls, making it impossible to accurately control the tension of the pipe.

The purpose of the present invention is to eliminate the above-mentioned drawbacks and provide a tension control device in which the tension value due to the bending of the pipe can be easily determined, and the rotation of a conveying device such as a pinch roll can be correctly controlled based on that value. shall be.

In order to achieve the above object, the configuration of the present invention is such that the welded pipe A is guided through a heating furnace 20 and an annealing furnace 30 to conveying devices such as pinch rolls 40 and 50, and is further subjected to post-processing such as side rolls 70 and Turk rolls 80. In a continuous pipe manufacturing line that is guided by a pipe, all or part of the transport device and post-processing device are placed on a movable bed 2 that is slidable in a direction along the flow direction of the pipe. The movable bed 2 is placed on the fixed bed 1, and a member 3 for detecting relative displacement between the movable bed 2 and the fixed bed 1 is provided, and an electric signal from the member is used to detect the transfer device 40. , 50 motors 60 are controlled.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In Figures 1 and 2, welded pipe A is
After passing through the pinch roll 10, the high frequency induction heating furnace 20, and the annealing furnace 30, the second and third pinch rolls 40,
50, further rounded by side rolls 70, straightened by Turk's rolls 80, and sent to the next process. The annealing furnace 30 includes a soaking furnace 31 and a water-cooled cooling zone 32 on the exit side thereof.

However, according to the present invention, the second pinch roll 4
0, the third pinch roll 50, the side roll 70, and the Turk's roll 80 are installed close to each other on the bed 2 which is movable along the flow direction of the pipe A. That is,
The movable bed 2 is slidable on the rail 1a of the fixed bed 1 via a linear bearing 2a. The fixed bed 1 and the movable bed 2 are connected by a connecting rod 3 along the moving direction of the movable bed 2, and a wire strain gauge 4 as a relative displacement detection member is attached to the surface of the connecting rod 3. has been done.

The strain gauge 4 is connected to an amplifier 5, and further connected via a controller 6 to a motor 60 for driving the second and third pinch rolls. The motor 60 is connected to the second pinch roll 40 and the third pinch roll 50 by a universal joint (not shown).
is connected with. The side rolls 70 and the Turk's rolls 80 are allowed to rotate freely.

The operating state will be explained above.

The pipe A, which has been formed and welded into a cylindrical shape, is fed through the first pinch roll 10, guided to a high-frequency induction heating furnace 20, heated, maintained at an isothermal temperature in a soaking furnace 31, and then heated in a cooling zone 32. Cooled and annealed. Therefore, the tube A is bent during the annealing process. This deflection acts as a resistance to the second and third pinch rolls 40 and 50, causing the movable bed 2 to which they are attached to move in a direction opposite to the direction in which the tube travels.

In other words, the tension in tube A is the wire strain gauge 4
This allows for more accurate detection. Therefore, the signal from this gauge 4 causes the amplifier 5 and the controller 6 to
By controlling the motor 60 through the above, highly accurate tension control becomes possible.

In addition to the embodiments described above, lower receiving rolls or a belt conveyor or the like may be used instead of the pinch rolls 40 and 50 as the conveying device. In addition, side roll 70 and Turk roll 80 are used as post-processing equipment.
In addition, after cutting, side rolls 70 and Turk's rolls 80, which are all or part of conveyors and the like, are mounted on the movable bed 2.

As described above, the present invention converts the tension caused by the bending during annealing of the tube A into the amount of linear movement of the movable bed, and further converts the amount of movement into an electric signal via the relative displacement detection member, and conveys the pinch roll etc. By controlling the rotation of the device's drive motor, highly accurate tension adjustment has become possible. As a result, bending of the pipe can be accurately and easily eliminated, which has a great effect on improving the quality of the pipe.

[Brief explanation of the drawing]

FIG. 1 is a process front view showing an embodiment of the present invention;
FIG. 2 is an enlarged front view of the main part. A1...Pipe, 10...First pinch roll, 20
...High frequency induction heating furnace, 30...Annealing furnace, 40...
...Second pinch roll, 50...Third pinch roll, 60...Drive motor, 70...Side roll, 80...Turks roll, 1...Fixed bed, 2...Movable bed, 3...Wire strain gauge , 4... amplifier, 5... controller.

Claims (1)

[Scope of utility model registration request] In a continuous pipe manufacturing line in which welded pipe A is guided through a heating furnace 20 and an annealing furnace 30 to conveying devices 40 and 50, and further guided to a post-processing device, all or part of the transfer device and the post-processing device is placed on a movable bed 2 that is slidable in the direction along the flow direction of the tube, and the movable bed 2 is placed on the fixed bed 1, and there is a gap between the movable bed 2 and the fixed bed 1. is connected to a connecting rod 3, and the connecting rod is provided with a relative displacement detecting member 4 for both beds,
The transport device 40,
1. A pipe tension control device for a continuous pipe manufacturing apparatus, characterized in that it controls 50 motors 60.