JPH05332874A - Inspecting method for torque of power-tight machine - Google Patents

Abstract

PURPOSE:To perform static torque inspection by increasing the tightening torque of a coupling chuck part to a specified value, and stabilizing the torque. CONSTITUTION:A reference torque sensor 8, wherein reference pipes 9 are connected to both ends, is arranged between a coupling chuck part 2 and a pipe chuck part 4. Rods are screwed into a sleeve having the right-handed screws and the left-handed screws at the upper and lower sides. An output-shaft holding and fixing member in a half-split shape is provided at an arm, which is pivoted to the tip of one rod. A jig 25 having the pivoting part to the base stage of a motor 3 is used at the tip of the other rod. An output shaft 21 of the motor 3 is fixed with the output-shaft holding and fixing member of the jig 25, which is pivoted to the base stage. A sleeve is manually rotated so as to advance the rods. Thus, the output shaft 21 is rotated, and the coupling chuck part 2 is rotated. The output values of the reference torque sensor 8 and a torque detector 7 are inputted into a control device 26. The error of the torque detector 7 with respect to the reference torque sensor 8 is tested by comparison and operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque verification method for a tightening torque detector of a power tight machine in which a coupling is screwed into one end of an oil country tubular good used for oil drilling.

[0002]

2. Description of the Related Art For example, a seamless steel pipe for oil wells specified in JIS G 3439 has threads at both ends, a coupling is mechanically tightened at one end, and a protective tool is provided at the other end where the coupling is not screwed and the coupling. Is specified to be installed. As shown in FIG. 4, a power tight machine for screwing a coupling into a threaded portion of a steel pipe at a specified torque rotates a power tight machine main body 31 having a coupling chuck 32 and a coupling chuck 32, for example. And a pipe chuck portion 34 for fixing a target steel pipe 36 having a coupling 35 tightened with a hand tight at the tip thereof.
4 is a torque detector 37 for detecting the tightening torque.
Is installed.

The coupling of the coupling 35 to the threaded portion of the target steel pipe 36 by the power tight machine is performed by the coupling 3
5 is previously hand-tightly tightened to the threaded portion by a certain amount, and the target steel pipe 36 is inserted from the pipe chuck portion 34 side to insert the coupling 35 into the coupling chuck portion 32 of the power tight machine body 31. Part 34
And the coupling chuck part 32 is closed, and the target steel pipe 3
Fix 6 Then, the electric motor 33 is started to rotate the coupling chuck portion 32 of the power tight machine body 31 via the output shaft, and the coupling 35 fixed by the coupling chuck portion 32 to the target steel pipe 36 fixed by the pipe chuck portion 34. Tighten to the specified torque. On the contrary, when the coupling 35 is to be tightened, the rotation direction of the coupling chuck portion 32 is reversed.

The tightening torque of the coupling to the threaded portion of the steel pipe is carried out by the torque time control method or the torque turn control method based on the torque detection value by the torque detector 37 provided in the pipe chuck portion 34. There is.
The torque / time control method is as shown in FIG.
When the output value of the torque detector reaches the threshold level A for determining the measurement start, the torque detection of the control device is started, and the torque B when changing from high speed to low speed changes the motor output shaft rotation speed from high speed to low speed. When the target torque C is reached, the electric motor is stopped and the coupling chuck and the pipe chuck are opened. If the tightening torque at this time is in the range from MIN to MAX in the shaded portion, the coupling tightening control is determined to be normal, and if it is outside the shaded portion, it is determined that the tightening is defective. The torque / turn control method is
As shown in FIG. 5 (b), when the output value of the torque detector reaches the threshold level A for determining the measurement start, the torque and turn detection of the control device is started, and when the high speed is changed to the low speed. When the motor output shaft rotation speed is switched from high speed to low speed with torque B, low speed tightening is continued, the detected torque reaches within the MIN or MAX torque set value, and the turn detection falls within the MIN or MAX turn range. Then, the electric motor is stopped and the coupling chuck and the pipe chuck are opened. If the tightening torque and the turn at this time are within the shaded area, the coupling tightening control is regarded as normal, and if the shaded area deviates from the shaded area, it is determined that the tightening is defective. In this case, the number of turns of the coupling chuck is detected by the pulse generator via the transmission shaft.

Further, in controlling the tightening torque of the coupling to the threaded portion of the steel pipe, conversely, the coupling may be unfastened from the target steel pipe. The purpose of this is to inspect the thread surface flaws after tightening the coupling (several bolts will be performed at the start of operation) and to check the shape of the tightening torque chart due to coupling failure and to replace the coupling. Back to. When the coupling is tightened, a tightening torque (Break out torque) is generated, and this output is also a management target. In this way, the torque control of the power tight machine is performed by tightening and tightening torque.

In the torque management of the power tight machine, the verification of the torque detector is one of the important factors. That is, a comparison test between the reference torque sensor and the torque detector is performed, and if the allowable value is deviated, the torque detector amplifier gain is adjusted, and comprehensive torque management of the power tight machine is performed (once / year). Further, the target steel pipe and the coupling are fixed by the three claws of the pipe chuck and the coupling chuck, respectively, but if the claws are worn away, the chuck performance is deteriorated. In this case, if the torque test of the torque detector is performed, if the chuck claw is worn, the coupling chuck is rotated to generate the tightening torque, the target steel pipe slips, and the torque of the torque detector becomes the specified torque. It can be detected by the reference torque sensor that the temperature does not rise, and wear of the chuck claw can be detected. Further, the verification of the torque detector may be specified by the customer, and the torque verification is required.

Conventionally, in the verification of the torque detector of the power tight machine, a verification reference torque sensor is fixed between the pipe chuck section and the coupling chuck section through the reference pipe by the pipe chuck section and the coupling chuck section. The motor is driven to rotate the output shaft to apply a constant load to the coupling chuck, and the verification is performed by comparing the output values of the verification reference torque sensor and the torque detector. Further, as another method, the torque detector is detached from the pipe chuck of the power tight machine, and the detached torque detector 37 is set on the load tester 40 as shown in FIG.
A method for carrying out load verification at regular intervals is implemented.

[0008]

In the above-described conventional method for certifying a torque detector using a reference torque sensor for certifying, the output shaft is rotated by an electric motor to rotate the coupling chuck portion, and tightening is performed in order to certify the static torque. Even if the torque is raised to a constant value and made stable, it is unavoidable that the torque becomes unstable and fluctuates. for that reason,
In the conventional test of the torque detector, the tightening torque is increased at once in the vicinity of the measured value of the reference torque sensor, the tightening torque rising straight line of the reference torque sensor and the torque detector is recorded by the electromagnetic oscillograph, and the torque values of both are recorded. For example, the accuracy is verified by reading every 100 kg-m. Therefore, the static torque test of the conventional torque detector is
Not done. In addition, the method of setting the torque detector removed in the load tester and verifying it is possible to verify the accuracy of the torque detector alone, but it is impossible to detect the trouble of the mechanical system of the power tight machine described above. ..

An object of the present invention is to perform a static torque test in a torque test of a torque detector of a power tight machine by rotating the output shaft to increase and stabilize the tightening torque of the coupling chuck part to a constant value. It is to provide using a torque verification method that can.

[0010]

[Means for Solving the Problems] The inventors of the present invention have made extensive studies to achieve the above object. As a result, instead of rotating the coupling chuck by the electric motor, manually rotate the output shaft of the electric motor using a jig and rotate the coupling chuck to increase the tightening torque and stabilize the verification torque. The present invention has been reached by the conclusion that the static torque test of the torque detector is possible.

That is, the present invention comprises a power tight machine body having a coupling chuck portion, an electric motor for rotating the coupling chuck portion, and a pipe chuck portion for fixing a target steel pipe having a coupling tightened with hand tight at the tip. In the torque verification method of the torque detector of the power tight machine consisting of the torque detector provided in the pipe chuck part, a reference torque sensor having a reference pipe connected to both ends between the coupling chuck part and the pipe chuck part is arranged, The reference pipes on both ends are fixed by the coupling chuck part and the pipe chuck part, the rods are respectively screwed into the sleeves having the right and left threads on the top and bottom, and the output shaft is gripped in half on the arm pivotally attached to the tip of one of the rods. Providing a fixing member,
A jig having a pivotal attachment portion to the base of the electric motor is used at the other rod tip, and the output shaft of the electric motor is fixed by an output shaft gripping fixing member of the jig pivotally attached to the base of the electric motor, and the sleeve is fixed. Manually rotate to advance the rod to rotate the output shaft,
Rotate the coupling chuck and input the output values of the reference torque sensor and torque detector to the control device for comparison and
The calculation verifies the error of the torque detector with respect to the reference torque sensor.

[0012]

In the present invention, rods are respectively screwed into sleeves having a right-hand thread and a left-hand thread on the upper and lower sides, and an arm pivotally attached to the tip of one of the rods is provided with a member for fixing the output shaft of the motor half, and the other. The other rod screwed to the sleeve is used before the verification of the torque detector provided on the pipe chuck part of the power tight machine by using a jig provided with a pivotal attachment member to the base of the electric motor at the rod tip of A tip pivot member is pivotally attached to the base of the electric motor, and a half-divided output shaft grip fixing member provided on an arm pivotally attached to the tip of one rod is fitted and fixed to the output shaft of the electric motor. When the sleeve is manually rotated, the rods screwed into the upper and lower right and left screws move forward and backward, so the output shaft of the electric motor fixed by the output shaft grip fixing member is rotated and the coupling chuck is rotated. And tightening torque can be applied.

In the torque test of this power tight machine, the tightening torque is generated by the rotation of the coupling chuck part due to the rotation of the output shaft of the electric motor by the jig and the fixing of the pipe chuck part on one side of the pipe. It is possible to perform static verification by transmitting each output signal transmitted to the test target torque detector to the control device. The verification can be performed by comparing / calculating the respective output signals by the control device and calculating the error of the test target torque detector with respect to the verification reference torque sensor.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIGS. FIG. 1 is an explanatory view of a torque inspection method of a torque detector of a power tight machine using the jig of the present invention, FIG. 2 shows a jig used in the method of the present invention, and FIG. Front view of the set state,
(B) The figure is a front view of the state in which the output shaft of the electric motor is rotated,
FIG. 3 shows a chart of detected torque. FIG. 3A shows the case of the torque verification method of the present invention, and FIG. 3B shows the case of applying a torque load by a conventional electric motor.

In FIG. 1, 1 is a power tight machine body having a coupling chuck portion 2, 3 is an electric motor for rotating the coupling chuck portion 2, 4 is a pipe chuck portion having a torque detector 7 for detecting a tightening torque. , 8
Is a reference torque sensor for verification in which reference pipes 9 are connected on both sides, and when performing the torque verification of the torque detector 7, the reference pipes 9 on both sides are fixed by the coupling chuck portion 2 and the pipe chuck portion 4. Then, when the output shaft 21 of the electric motor 3 is rotated by the jig 25, the coupling chuck portion 2 is rotated and the verification torque is applied to the reference torque sensor and the torque detector 7.

As shown in FIG. 2, the jig 25 has a rod 12 on the upper side of a sleeve 11 having right and left threads on the top and bottom.
Are screwed together, and the arm 1 is attached to the tip of the rod 12 by the pivot 14.
One end of 3 is rotatably pivoted, and the other end of the arm 13 is
An output shaft gripping fixing member 16 of the electric motor which is capable of being fastened by a fastening bolt 15 is provided. A rod 17 is screwed onto the lower side of the sleeve 11, and the tip end of the rod 17 is configured to be pivotally attached to a mounting member 19 provided on a base 18 of the electric motor by a pivot 20. Reference numeral 22 is a key for coupling the output shaft 21, and 23 is a handle for rotating the sleeve 11.

When performing the torque verification of the torque detector provided in the pipe chuck of the power tight machine by the method of the present invention, as shown in FIG. 1, a verification standard is provided between the pipe chuck 4 and the coupling chuck 2. The torque sensor 8 is fixed by the pipe chuck portion 4 and the coupling chuck portion 2 via the reference pipe 9, the jig 25 is set on the output shaft 21 of the electric motor 3 as shown in FIG. Rotate sleeve 11 to rotate rods 12, 1
7 is advanced, the tip of the rod 17 is the base 1 of the electric motor 3.
Since it is pivotally attached to the attachment member 19 provided on the No. 8 by the pivot shaft 20, the output shaft 21 of the electric motor 3 is rotated and the coupling chuck portion 2 is rotated as shown in FIG. A constant load is applied to the pipe 9. On the other hand, since one end of the reference pipe 9 is fixed by the pipe chuck 4, a tightening torque is generated. The tightening torque is detected by the verification reference torque sensor 8 and the torque detector 7 and input to the control device 26. The control device 26 compares and calculates the tightening torques input from the verification reference torque sensor 8 and the torque detector 7, calculates the error of the torque detector 7 with respect to the verification reference torque sensor 8, and performs the verification. ..

In the case of the method of the present invention, since the torque is increased by the manual rotation of the coupling chuck portion by the jig, as shown in FIG. 3 (a), the verification torques T ₁ , T _{2 are obtained.}
Becomes stable, and it becomes possible to perform a static torque test. On the other hand, in the torque verification by the rotation of the electric motor of the conventional method, since the torque is increased by the rotation of the coupling chuck portion by the electric motor, the verification torques T ₁ and T ₂ are unstable as shown in FIG. 3 (b). Therefore, the static torque verification cannot be performed.

When the torque detector of the power tight machine was tested by the method of the present invention, the test accuracy was ± of that of the conventional method.
It improved from 20 kgm to ± 4 kgm. The reproducibility of the torque test when the torque is increased and decreased is ± 4 kgm.
It was possible to carry out in the range of. Moreover, since the verification torque was stable, the verification time could be shortened by 20%.

[0020]

As described above, according to the method of the present invention, the verification of the torque detector of the power tight machine can be performed by the static torque verification, and the verification accuracy and the torque verification reproducibility are significantly improved. it can. Moreover, the verification time can be shortened.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a torque inspection method for a torque detector of a power tight machine using the jig of the present invention.

FIG. 2 shows a jig used in the method of the present invention,
FIG. 6A is a front view of a state in which a jig is set, and FIG. 6B is a front view of a state in which an output shaft of an electric motor is rotated.

3A and 3B are charts showing detected torque, wherein FIG. 3A shows the case of the torque verification method of the present invention, and FIG. 3B shows the case of applying a torque load by a conventional electric motor.

FIG. 4 is an overall configuration diagram of a power tight machine.

5A and 5B are explanatory diagrams of a torque control method for a conventional power tight machine, in which FIG. 5A shows a torque / time control method, and FIG. 5B shows a torque turn control method.

FIG. 6 is an explanatory diagram of a conventional torque detector verification method using a load tester.

[Explanation of symbols]

 1,31 Power tight machine main body 2,32 Coupling chuck part 3,33 Electric motor 4,34 Pipe chuck part 5,35 Coupling 6,36 Target steel pipe 7,37 Torque detector 8 Reference torque sensor 9 Reference pipe 11 Sleeve 12 , 17 Rod 13 Arm 14, 20 Axis 15 Tightening bolt 16 Output shaft grip fixing member 18 Base 19 Mounting member 21 Output shaft 22 Key 23 Handle 25 Torque verification jig 26 Controller

Claims (1)

[Claims] 1. A power tight machine body having a coupling chuck portion, an electric motor for rotating the coupling chuck portion, a pipe chuck portion for fixing a target steel pipe having a coupling tightened with hand tight at its tip, and a pipe chuck portion. In the torque inspection method for the torque detector of the power tight machine, which consists of the torque detector provided in the above, a reference torque sensor with reference pipes connected at both ends is provided between the coupling chuck part and the pipe chuck part. Is fixed by the coupling chuck part and the pipe chuck part, and the rods are respectively screwed into the sleeves having the right and left threads on the top and bottom. The output shaft of the electric motor is electrically driven by using a jig that has a pivotal connection to the base of the electric motor at the other rod tip. Fix it with the output shaft grip fixing member of the jig pivotally attached to the motive base, rotate the sleeve manually to advance the rod to rotate the output shaft, rotate the coupling chuck part, and rotate the reference torque sensor and torque. A torque verification method for a power tight machine, characterized in that the output value of the detector is input to a control device, and the error of the torque detector with respect to the reference torque sensor is verified by comparison and calculation.