JPH0350404Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an edge wave meter measuring device for detecting the condition of the edge of an open pipe of an electric resistance welded pipe.

The electric resistance welded pipe is continuously formed into an open pipe in the forming process, and in the next welding process, the V-shaped edge of the open pipe is pressurized from the lateral direction and welded. In this case, the shaping of the open pipe has a great influence on welding, and it is no exaggeration to say that the welding quality and yield of the electric resistance welded pipe are determined by the quality of the shaping.

However, conventionally, there is no method to quantitatively evaluate the quality of open pipe forming. Changes in cutting width, etc., were visually observed and judged. As a result, the following problems occurred.

(1) There are individual differences in the ability of workers to understand changes in the edge.

(2) Minute edge fluctuations are difficult to grasp visually.

(3) It is not possible to quantitatively compare the molding state due to changes in dimensions, materials, roll chances, molding settings, etc.

(4) Even if we develop technology to improve the level of molding, it is not possible to make quantitative comparisons with conventional methods.

The present invention was made to solve the above-mentioned conventional problems, and the purpose is to obtain an edge wave measuring device that can quantitatively grasp the condition of the edge of an open pipe. be.

The edge wave measuring device according to the present invention has a sliding contact at one end that slides into contact with the edge of an open pipe of an ERW pipe,
A welding lead part that is swingably attached to the main body axis,
A shaft having a roller at its tip that contacts the other end of the welding lead and is movably mounted on a support plate; a spring that constantly presses the roller against the other end of the welding lead; Consisting of a displacement-electrical converter that has a contact that moves up and down and converts the mechanical displacement of the contact into an electrical signal, and a movable plate that has one end fixed to a shaft and the other end that comes into contact with the contact. It is characterized by: The present invention will be explained below using the drawings.

FIG. 1 is a side view of an embodiment of the present invention, and FIG. 2 is a front view thereof. In the figure, reference numeral 1 denotes a welding lead, which is swingably attached to a main body shaft 2, and a sliding contact 3 is provided on the lower surface. 4 is an insulating plate fixed to the end of the welding lead part 1. Reference numeral 5 denotes a follow-up mechanism, and a roller 8 is rotatably attached to the tip of a shaft 7 that is vertically slidably attached to a support plate 15 via a pole bush 6. Reference numeral 9 denotes a coil spring that presses the roller 8 against the insulating plate 4 at all times. Reference numeral 11 denotes a displacement-to-electrical converter such as a differential transformer, which is attached to a support plate 15, and is brought into contact with a movable plate 10 fixed to the shaft 7 of the follower mechanism 5 through a contactor 12 connected to the core. . The movable plate 10 is interposed between the following mechanism 5 and the contact 12 because
This is because the displacement of the insulating plate 4 also includes thrust, and this thrust is not transmitted to the displacement-electrical converter.

Next, the operation of this embodiment configured as described above will be explained. In addition, it is assumed that the open pipe OP is fed in the direction of the arrow, and the sliding joint 3 is attached to the edge E.
are in constant sliding contact. Now, for example, when the sliding contact 3 rides on the convex part of the edge E, the welding lead part 1 rotates in the direction of arrow a around the main body shaft 2, and the tip of the insulating plate 4 fixed thereto descends. do. As the insulating plate 4 is displaced, the roller 8 and the movable plate 10 pressed against it also descend, and following this, the contact 12 of the displacement-electrical exchanger 11 also descends, and the displacement-electrical exchanger 10 outputs an electric signal corresponding to the size of the convex portion of the edge E. Furthermore, when the sliding contact 3 falls into the recess in the edge E, the contact 12 rises due to the opposite effect to the above, and the displacement-electrical exchanger 10 outputs an electrical signal corresponding to the size of the recess. . In this case, the contact 1 is connected via the movable plate 10.
Since no thrust is generated in the contact 12, damping does not occur in the contact 12, and smooth operation can be achieved.

In this way, by continuously measuring the state of the edge of the open pipe moving at high speed using the displacement-electrical exchanger, it is possible to quantitatively and accurately grasp the forming state of the open pipe.

In the above explanation, the roller is pressed against an insulating plate that swings in response to the state of the edge of the open pipe, and the displacement of the roller is measured by a displacement-electrical exchanger via the movable plate. The displacement of the insulating plate may be directly detected by a displacement-electrical exchanger, and since the insulating plate swings at high speed and exhibits a vibrating state, the vibration of the insulating plate may be detected by a vibration meter. moreover,
In the above embodiment, a differential transformer is used as the displacement-electrical exchanger, but it goes without saying that other converters may be used.

As is clear from the above description, the present invention can bring about the following remarkable effects.

The rotational moment of the welding lead, which oscillates in response to fluctuations in the edge of the open pipe, is converted into vertical motion by a shaft with a roller at the tip, and the vertical motion of the shaft is converted into displacement-electricity via a movable plate. Since the power is transmitted to the contact of the converter, there is no thrust on the contact, and the contact can be operated smoothly without damping. It is possible to quantitatively and accurately measure the fluctuation state of the part. Therefore, along with this effect, the following effects also occur.

(1) The forming level can be improved by evaluating the quality of the forming settings of open pipes during normal operation and providing feedback to the forming settings.

(2) During normal operation, it is possible to improve the accuracy of the forming settings for open pipes, thereby achieving stable welding quality and improving yield.

(3) Since the results of technological development related to open pipe forming can be accurately evaluated, technological development can be promoted efficiently.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention, and FIG. 2 is a front view thereof. 1: Welding lead part, 3: Sliding joint, 4: Insulating plate,
5: Follow-up mechanism, 11: Displacement-electrical converter, OP:
open pipe.

Claims (1)

[Scope of utility model registration request] It has a sliding joint on one end that slides into contact with the edge of the open pipe of the ERW pipe, a welding lead part that is swingably attached to the main body shaft, and a roller on the tip that makes rolling contact with the other end of the welding lead part. It has a shaft mounted on the support plate so that it can move up and down, a spring that always presses the roller against the other end of the welding lead, and a contact that is installed in parallel with the shaft and moves up and down. An edge wave measuring device comprising: a displacement-to-electrical converter that converts displacement into an electrical signal; and a movable plate having one end fixed to a shaft and the other end abutting a contact.