JP2962221B2 - Detect and display device for screw tightening completion position - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting a tightening completed position of a screw having a sealing function, such as a tapered screw provided at an end of an oil country tubular good, and marking the detected position. is there.

[0002]

2. Description of the Related Art For example, in the case of oil country tubular goods, it is sometimes required to mark a position where a tapered screw provided at an end of the oil well pipe is completely tightened. Conventionally, as a means for detecting and marking the tightening completion position, an operator attaches a stop mark gauge 1 to a tapered thread portion 2a provided at an end of the oil country tubular good 2 as shown in FIG.
In this case, the position in the circumferential direction is detected by fitting the mark on the surface, and marking is performed on the detected position.

[0003]

By the way, when the above-mentioned tightening completion position is detected and marked on-line, if an operator manually relies on a conventional manual operation, an operator is always detected and marked. Must be placed. In addition, this manual operation takes a long time for detection and marking, so that line efficiency is reduced.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a device capable of mechanically detecting and marking a tightening completion position which has conventionally relied on manual work. And

[0005]

In order to achieve the above object, a device for detecting and displaying a screw tightening completion position according to the present invention comprises: a device for rotating a material stopped at a predetermined position in place; A ring gauge arranged relative to the end face of the workpiece, a mechanism for holding the ring gauge and moving it toward and away from the end face according to the rotation of the material, and for aligning the ring gauge according to the diameter of the material. A height position adjusting mechanism, a floating mechanism that follows the eccentricity of the material and facilitates the fitting of the ring gauge to the material end, a mechanism that detects a fitting completion position of the ring gauge and the material, It has a marking device that is always located above the tip of the ring gauge, and if necessary, detects the axial position of the material and stops the material at a predetermined position. With each other to set up.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The detection and display device for a screw tightening completion position according to the present invention employs the following configuration.
First, the material stopped at a predetermined position by the rotating device is rotated in place, and a ring gauge is relatively disposed on an end surface of the material. The ring gauge is held, for example, via an indexing table and a scroll chuck, and is moved closer to the end face in accordance with the rotation of the material by, for example, a ball screw rotated forward and reverse by a servomotor, so that the ring gauge is moved to the surface of the material. Fit to the end.

At this time, in order to align the ring gauge with the material in accordance with the diameter of the material, the ring gauge is installed so as to be vertically movable by a height position adjusting mechanism, and the eccentricity of the material rotating on the spot is set. In order to easily fit the ring gauge to the material end, a floating mechanism is interposed.

When the engagement between the ring gauge and the material is completed, the position is detected by, for example, a steel ring provided inside the ring gauge and a torque sensor, and the detected position is arranged so as to be always positioned above the tip of the ring gauge. Marking is performed by the marked marking device. By the way, in order to stop the material at a predetermined position, a mechanism for detecting the axial position of the material and stopping the material at the predetermined position is installed even if the operator artificially stops using a stopper or the like. May be.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to an embodiment shown in FIG. FIG. 1 is a front view showing a schematic configuration of a device for detecting and displaying a screw tightening completion position according to the present invention.

In FIG. 1, reference numeral 11 denotes a device for detecting and displaying the screw tightening completion position of the present invention, and has, for example, the following device configuration. Reference numeral 12 denotes a detector that detects the axial position of the oil country tubular good 2, for example, to stop the oil country tubular goods 2 at a predetermined position. The oil country tubular goods 2 whose position is detected by the detector 12 and stopped at the predetermined position, For example, a pair of tube rotating rollers 13a whose outer periphery is lined with urethane rubber and arranged at a predetermined interval, and a pair of tube rotating rollers arranged above these tube rotating rollers 13a. The oil well pipe 2 located on 13a is rotated on the spot by a rotating device 13 composed of a press roller 13b for holding the oil well pipe 2 from above. The rotation of the tube rotation roller 13a is controlled by, for example, an inverter, and a brake is attached so that the rotation can be instantaneously stopped at the fitting completion position. The outer periphery of the pressing roller 13b is also lined with urethane rubber.

Reference numeral 14 denotes an indexing table 1 on a moving frame 18.
5 is a ring gauge held by a scroll chuck 16 attached to the oil well pipe 5, and is arranged to face the end surface of the oil country tubular good 2. The ring gauge 14 is used for the oil country tubular goods 2
The female screw 14a fitted to the tapered screw portion 2a is provided on the inner peripheral surface. The female screw 14a is formed of, for example, a polymer-based plastic in order to prevent seizure at the time of fitting. Further, a steel ring 14b is provided inside the inner periphery of the ring gauge 14, so that the positioning accuracy of the tightening completion position can be ensured. In addition, this female screw 1
4a, the interference amount with the tapered thread portion 2a of the oil country tubular good 2 is set to zero, and positioning is performed, for example, on the end face of the oil country tubular good 2 and the 3 ° surface of the screw.

Reference numeral 17 denotes a mechanism for moving the ring gauge 14 toward and away from the end face thereof in accordance with the rotation of the oil country tubular good 2. As the contact / separation moving mechanism 17, a servomotor 17b having an encoder 17a in this embodiment is used. With ball screw 1
7c is rotated forward and reverse, and a moving frame 18 having a nut body (not shown) screwed to the ball screw 17c is moved toward and away from the oil country tubular good 2. In this embodiment, an LM guide 17d is disclosed so that the contact and separation movement can be performed smoothly.

Reference numeral 19 denotes a height position adjusting mechanism for centering the ring gauge 14 according to the diameter of the oil country tubular good 2. The contact / separation moving mechanism 1 is, for example, a screw jack.
7. The one that moves the ring gauge 14 up and down together with the moving frame 18 is adopted. Reference numeral 20 denotes a floating spring, which is a floating mechanism. The ring gauge 14 follows the eccentricity of the oil country tubular good 2, and facilitates the fitting when the female screw 14a is fitted to the tapered thread portion 2a of the oil country tubular good 2. It is installed for.

Reference numeral 21 denotes a torque sensor for detecting a circumferential torque in a mechanism for detecting a position where the ring gauge 14 and the oil country tubular good 2 are completely fitted. For example, this fitting completion position detecting mechanism can be adjusted by a load cell that turns on and off at 5 to 10 kg in the circumferential direction while utilizing the switching action of the end face of the oil country tubular good 2 and the steel ring 14b in the axial direction. A switch having a limit switch and capable of monitoring both the torque and the axial position is employed.

Reference numeral 22 denotes a marking device disposed on the moving frame 18 so as to be always positioned above the tip of the ring gauge 14, and has a configuration in which a marking stamp 22b is attached to a rod end of a cylinder device 22a, for example.
It goes without saying that the mark uses a paint that does not become unclear in the subsequent phosphoric acid treatment step.

The screw tightening completion position detection and display device 11 of the present invention has the above-described configuration. In this embodiment, the screw tightening completion position detection and display device 11 is guided by the retract rail 23 to about 2 m. It discloses a structure that can be set back so as not to hinder workability when manufacturing other types of products.

Next, a method of detecting the tightening completion position in the tapered thread portion 2a of the oil country tubular good 2 using the above-described screw tightening completion position detection and display device 11 of the present invention and marking the detected position will be described. I do.

First, before starting the work, a conventional stop mark gauge is used, and a marking is made at the tightening completed position in the tapered thread portion 2a of the oil well pipe 2 of the kind (size) to be marked at the screw tightening completed position this time. Into a standard oil well pipe 2. Then, after fitting the standard oil well pipe 2 to a predetermined position (tightening completion position) of the ring gauge 14, the position where the scribe is put on the oil well pipe 2 is aligned with the position of the marking stamp 22b. The gauge 14 is fixed to the scroll chuck 16.

When the preliminary preparation is completed as described above, the oil country tubular good 2 to be marked is conveyed online to the screw tightening completion detection / display device 11 of the present invention. The transferred oil well pipe 2 is the detector 1
2 detects the axial position and stops at a predetermined position.

With respect to the oil country tubular goods 2 stopped at a predetermined position, the holding roller 13b descends to sandwich the oil country tubular goods 2 with the pipe rotating roller 13a, and rotate the oil country tubular goods 2 on the spot. next,
Activate the servo motor 17b to rotate the oil country tubular goods 2
The ring gauge 14 is moved closer to the end face of the oil well pipe 2, and the ring gauge 14 is fitted into the oil country tubular good 2. The height of the ring gauge 14 is adjusted in advance by a height position adjusting mechanism 19 according to the outer diameter of the oil country tubular good 2 to be marked. Further, when the ring gauge 14 is fitted into the oil country tubular good 2, even if the end surface of the rotating oil country tubular good 2 is eccentric, the ring spring 14 follows the eccentricity of the oil country tubular good 2 by the action of the floating spring 20. The end of the tube 2 is fitted.

When the engagement between the ring gauge 14 and the oil country tubular good 2 is completed, the position is detected by the steel ring 14b provided inside the ring gauge 14 and the torque sensor 21, and the rotation of the pipe rotating roller 13a is detected at the detected position. The operation of the servomotor 17b is stopped instantaneously. Then, the rod of the cylinder device 22a is extended, and the marking stamp 22 is positioned at the screw tightening completed position of the stopped oil country tubular good 2.
Press b to apply marking.

After the marking, the servo motor 17
b is operated again to move the ring gauge 14 away from the end face of the oil country tubular good 2 and to press the holding roller 13b.
Is raised and the oil country tubular goods 2 are sent to the next process, and it prepares for the marking of the next oil country tubular goods 2.

In order to correct the circumferential displacement caused by the wear of the ring gauge 14, a conventional stop mark gauge is used to mark the tightening completed position every fixed number of work so as not to exceed the allowable range. Then, the ring gauge 14 is rotationally adjusted in the circumferential direction using the indexing table 15,
Fix it. If the number of operations for this adjustment operation is controlled by a preset counter, the marking operation can be performed for a long time without adjustment, and the marking accuracy can be prevented from deteriorating.

The rotating device 13, the contact / separation moving mechanism 17, the height position adjusting mechanism 19, the floating mechanism, and the marking device 22 constituting the screw tightening completion position detecting and displaying device 11 according to the present invention in this embodiment. It is needless to say that an appropriate mechanism such as using a cylinder device as the height position adjusting mechanism 19 is not limited to the disclosed one.

[0025]

As described above, the device for detecting and displaying the screw tightening completion position according to the present invention can mechanically detect and mark the tightening completion position, which has conventionally relied on manual work. Can be shortened and work efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a schematic configuration of a device for detecting and displaying a screw tightening completion position according to the present invention.

2A and 2B are diagrams for explaining a conventional operation of detecting and displaying a screw tightening completion position, where FIG. 2A is a cross-sectional view of a main part and FIG. 2B is a plan view.

[Explanation of symbols]

 2 Oil Well Pipe 11 Detecting and Displaying Position of Screw Tightening Completion 12 Detector 13 Rotating Device 14 Ring Gauge 16 Scroll Chuck 17 Movement Mechanism 19 Height Adjustment Mechanism 20 Floating Spring 21 Torque Sensor 22 Marking Device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B21C 51/00 B21D 22/02

Claims (2)

(57) [Claims] 1. A device for rotating a material stopped at a predetermined position on the spot, a ring gauge arranged relative to an end face of the material, and holding the ring gauge, and attaching the ring gauge to the end face according to the rotation of the material. A mechanism for moving toward and away from the
A height position adjusting mechanism for centering the ring gauge according to the diameter of the material, a floating mechanism that follows the eccentricity of the material and facilitates fitting of the ring gauge to the material end, and a ring gauge. An apparatus for detecting and displaying a screw tightening completion position, comprising: a mechanism for detecting a position at which fitting with a material is completed; and a marking device arranged to be always positioned above a tip of the ring gauge. 2. The device according to claim 1, further comprising a mechanism for detecting the axial position of the material and stopping the material at a predetermined position.