JPS597242A - Method and device for inspecting fitting of screw thread - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an object to be examined, such as a drill pipe for oil drilling,
Is Tc engraved on the coupling etc.? - It relates to a screw fitting inspection method and apparatus tl-t for determining the degree of fitting accuracy or compatibility of the screws by screwing a screw gauge into the spring screw.

Conventionally, this type of fitting inspection method generally uses ΔPjI
(American Petroleum King's'l,
1-tute) The manual tightening inspection method according to the standard is applied. In this method, a thread gauge equipped with a handle arm of a predetermined length σ is rotated in the forward direction and screwed into the thread carved in the test object. Tighten carefully to avoid scratches and scratches.

You can intuitively know if a car/eating fJ has occurred, so please
Twist it in. Thus, the above APL provisions are concluded (NJ'
Screw in 1 tl ftc with i torque (075 to 50 kti-rn) and visually confirm that the distance (standoff) between the screw gauge and the test object is within the specified range.
Measure and record the value. The fitting accuracy of the screws is then inspected by rotating the screw gauge in the opposite direction and removing it from the test object.

In this method of inspecting the screws by manual screwing method, it is necessary to
Since it is necessary to carefully screw the screw gauge into the screw engraved on the test piece f4= so as not to scratch the ``Ii'', it requires a person who is experienced in mind and body 11F, and there is also the problem of low inspection ability. There is.

In view of the above, an object of the present invention is to automate the fitting inspection of screws, and to determine the tightening torque value, L and standoff value as an index value of the fitting accuracy of the screw or the degree of JT conversion. It is an object of the present invention to provide a method and device for inspecting the fitting of screws, which can be detected and displayed visually, is easy to handle, and can increase inspection capability.

The gist of this invention is that after the advancing Taper screw gauge and the Taper screw carved on the test object come into contact with each other in an aligned state, the screw gauge is rotated in the opposite direction or is rotated in the reverse direction while a first step of detecting the screwing start position between the screw gauge and the screw No. 1; and a first step of detecting the screwing start position of the screw gauge No. a second step of measuring a torque value and a standoff value; and a third step of retracting the screw gauge while rotating it in the opposite direction when the screw gauge reaches a predetermined standoff value to separate it from the DiJ screw. It consists of ItJ 1st, 2nd and 3rd
11: A method for inspecting the fit of screws that operates and measures in sequence, and (2) a gripping mechanism for the test object arranged at the top of the machine frame, and (1) arranged in an aligned state at the top of the machine frame. The rotary lifting mechanism is equipped with a rotating lifting mechanism for a screw gauge, and the rotating lifting mechanism is capable of measuring a tightening torque value and a standoff value when the screw gauge and the screw engraved on the test object are screwed together. , Iso (11g) is my fitting inspection device.

Below 1, Example 1JII of the screw fitting inspection device according to the present invention
The configuration and inspection method will be described based on FIGS. 1 to S showing an i example.

In Fig. 1, 1 (/ is the machine frame, / is the object to be inspected, for example, a coupling with an inwardly engraved Taper female thread /A. ! is the object / to the predetermined position 16, and On the pedestal (
How many frames 1 (fl is fixed to /? This object /'s stage fJ
As shown in Fig. 2, there is a split chuck in the opening/B.
2A111.2) 3 or 11 contacts.

lI3 is a ring-shaped spring that surrounds the split chuck 1I2ASl/-λ1 from the circumference so that it always gathers at the center rπS. 1IIA is the first shilling; The first sliding inside the cylinder l1Il
Piston q-s l Qm rfls n-split chuck I@, 2A.

It is formed so as to surround the 15th end of l/-213. O is the first cylinder, and the upper end of the second piston lI7 that slides inside this second cylinder is for sliding the split chuck 12△, t/-2I3 from the center in the soil radial direction. The F facing J head cone Hiroshi/Vζ is served. 50 is a pressure device in which a first cylinder tl≠ and a second cylinder tag O are bored on the same axis. In this configuration, when a pressure medium is introduced from the pipe line tl etc. into the first cylinder 1lt1 and the second cylinder B, the first piston 15 descends and the second histone 1171ri rises. Therefore, the split-type chuck II is
2Δ, 13[3 slides toward the center and does not come into contact with the step f's/1':3 of the subject/. Further, when the pressure medium is introduced from the pipe line Ilq to the first cylinder lt1 and the second cylinder B, the first piston IIS moves up by 1, and the second piston moves down by 1. ), the split type chuck ≠ λΔ, l1213 slides in the radial direction against the f' force of the ring-shaped spring and comes into contact with the step f' of the subject/13, always The object to be examined is held by the pedestal 2 with its axis aligned with the axis of the pressure device 50.

Next, 3, which is not shown in Figure 1, has a Taber male screw of the same shape as 1 female screw/△ engraved on the 1st circumference. , and the gauge 3 are arranged on the same axis -1-UC. This threading gauge 3 UC is shown in Figure 3 f (both gears 3/ are set in the direction shown, and 4i + b glj of spindle l).
It is the rotation '\sliding i-+f function. 32 spring 1-gauge 3 passing through cl:, Me III Nando. This bed case
3-1 - For the force, the beam 3 is attached to the inner cylinder 5 using a rod 3g.
A coil spring 33 extrapolated from the spindle IIVc is interposed so that the tension gauge 3 is always in contact with the thread 32. The beam 30 has several layers of 21-point microswitches MS, and the contact ΦIN faces the deflection gauge 3 with a small space between them.3S is a stand-off detection rod, and the beam 30 is inserted 1 m into the end of the rod, and it is in contact with the extension of the ten-end surface of the spring gauge 3.
Stay at 1. 3 B is installed vertically on beam 30, -1: tfl (
1.37 is a conductive wire that connects the indicator 37 and the microswitch MS.

Next, S shown in Figure 1 is an inner cylinder that is fixed to the machine frame DO/L, 1ζ
It is possible to slide along the spline 68 carved inward on the sotoura otto (l direction). These are permanent magnet pieces 7, gil-1T.
i, and a small gap C is formed between the two as shown in FIG.

Next, the flange shown in FIG. 1 is a flange that is integral with the spindle l, and an electromagnet piece /2 is provided around the lower surface of the flange. Also, a slight gap is formed inwardly in the inner cylinder S at a position facing the ``electromagnet piece/''. 1/3 II magnetic pieces are installed. This is a permanent magnet) 7. Electromagnet piece / 2
, /3, the spindle t is automatically maintained in an aligned state. l≠ is an i+J reverse torque motor fixed to the inner side of the inner cylinder S, and connected to the flange // by a bolt /S. /B is 4 wires connecting Micro Sinch MS and torque motor /4&, /7 is torque motor /4
'F4 wire, 7g connects the tightening fJ torque meter (detects by current fluctuation of torque motor/l) installed with the tread bell 13 at 'F', and the micro This is a conductive wire that connects the switch jφ)). /wa is the hanging position where the 1-1 end i'fls of the inner cylinder 3゛ is hung, 20
is an eye bolt screwed into the center of the hanging position, 2/ is -zo I
A wire lobe M is hooked to an eye bolt 20, and the other end is hooked to a weight 23, and 22 is a slide connected to a drive source (for example, a reversible motor with a crown f=J) K, not shown.

In addition, when the thread gauge 3 and the female thread /Δ are not screwed together, the weight can be adjusted by dropping it by its own weight.

In order to put into practical use the screw fit inspection device constructed as described above, the following operational adjustments and inspections are required to determine the operating conditions of each part using a defect-free test object. I do.

(1) Put the subject on a pedestal! The official residence i
Adjust the strokes of the first piston/+5 and the first piston/+5 so that they come into contact with and grip the IJ. .

(2) The permanent magnet piece 7, g and the electromagnet piece/! , 73
Adjust the air gap C so that the spindle t is automatically maintained in a well-aligned state by balancing the repulsive force caused by the spindle t.

(3) When the thread gauge 3 comes into contact with the test object / female thread / △, the contact ΦIN immediately contacts the end face of the 30 thread gauges and turns on the first contact of the micro switch 1\4S. state, switch the second contact to the OF JI' state and adjust so that the torque motor l/l rotates in reverse.

(≠) When the thread rising part of the thread gauge 3, which comes into contact with the female thread/A and gradually starts to increase contact negative A+:r, passes through the screwing start position of the female thread/A, the coil 33 Due to the elastic force of , the screw gauge 3 is momentarily lowered to 1IllI.
When the contact with I and N is released and a change in position is detected,
Adjust so that the first contact of the microswitch MS is in the 01")l' state U, the second contact is switched to the ON state, and the torque motor/4' rotates in the forward direction.

(5) The contact part 35A of the standoff detection rod 35 comes into contact with the subject/gBM, and this detection: 1. II When the upper end surface of the rod 35 touches the direction, 4137 K, the microphone U swing-r-M ``y> (1) 1st tag point i ON state r, tQ [, J [7th point f Q 11'
Adjust the rotation to reverse rotation for a predetermined period of time using a timer (not shown) or a timer (not shown).

(B) Adjust the circumferential speed of pulley 2 using a drive source (not shown) so that it almost matches the pitch of the female thread A of the test object.
The circumferential speed of this pulley 22 and the rotational speed of the screw gauge 30 are
to make a lance.

(7) Adjust the reverse rotation speed of the pulley 22 so that the screw gauge 3 returns to its original position within the timer operating time described in (!;).

The current fluctuation range of this torque motor is within the tightening torque tolerance range specified above (075~/
, 30 kg-m).

Next, aspects of the method for inspecting the fit of the specimen (coupling) in the flow process after the thread cutting process will be explained in the order of the first, second, and third steps.

First, after applying a small amount of thread oil to the female thread /A, the subject 1 is placed on the pedestal 20 at a predetermined position. Next, pressure oil as a pressure medium is introduced into the first cylinder 1 ft and the second cylinder into O from the pipe wjt, the first piston t15 rises, and the second
The piston lI7 and the truncated cone body 4 which is screwed onto this vc
'/ falls. As a result, the split type chuck 112
A and 11.2B slide in the radial direction and come into contact with the stepped part of the subject to hold it.

Next, when the pulley 22 is rotated at a predetermined circumferential speed in the direction of the arrow A, the thread gauge 3 installed on the spindle in the aligned state within the inner cylinder S gradually descends and comes into contact with the female thread /A. However, the inner cylinder 5 is further lowered.Then the contact N of the microswitch MS comes into contact with the upper end surface of the screw gauge 3, and the first contact is in the ON state and the second contact is in the OFF state. ”
state. Therefore torque motor/4'
tri Rotate in reverse (screw gauge 3 rotates to the left),
At the moment when the thread gauge 3 passes through the screwing start position of the female thread /Δ, the thread gauge 3 is lowered and released from contact with the dowel N. As a result, the first contact of the microswitch MS is switched to the OFF state, and the second contact is switched to the ON state.
l rotates IF (screw gauge 3 rotates clockwise) while internal IWI
3, and the screw gauge 3 tightens the current fluctuation of the torque motor /4 at Qζ when screwed together with the female thread /A.]
Measure the torque using AM. In the event that this current fluctuation range fluctuates more than that during the above-mentioned operation adjustment, an alarm bell B rings to notify that the precision of the magic metal between the screw gauge 3 and the female screw /A is poor. In this case, immediately rotate the torque motor/ll in the opposite direction and move the screw gauge 3 backward (upward).
let As shown in Fig. S, the thread gauge 3, which is rotating clockwise, falls and the contact piece 33A comes into contact with the upper end surface /C of the object to be examined, and the thread gauge 3 is further screwed into the first part. , if the predetermined standoff value (the distance between the upper end surface 3A of the thread gauge 3 and the second end surface/C of the object l) S is, for example, Maruyama thread g mountain/in), ±l mountain/in.
inK: When reached, the indicator 37 comes into contact with the standoff detection rod 35, and the first contact of the microswitch MS is o.
At NyB, the second contact is switched to the OFF state by the torque motor /lu+1+ and rotates in the opposite direction (thread gauge 3 rotates counterclockwise), and the pulley 22 rotates in the direction of the arrow 1'', so the screw gauge 3 rotates in the direction of the arrow. rises together with the inner cylinder S. In this case, since the signal output from the instruction 3137 is transmitted to a timer (not shown), the torque motor/l and the pulley 22
The drive source operates for a predetermined time (a predetermined time from the position of the screw gauge 3 shown in FIG. 5 until it returns to position -1 shown in FIG. 1).

After that, pressure oil is introduced into the first cylinder l1lI and the second cylinder qB from the pipe t, and the split type chuck 112A is
, 112B and the stepped portion/13 of the subject l is released, and the subject l is transferred to the next process by manual operation.

In addition, in the above screw fitting inspection device @, screw gauge 3
In order to keep the spindle attached to the F end aligned, repulsive permanent magnet pieces 7, g and electromagnet pieces /2, /
3 to spindle t evening [song, inner surface of inner cylinder 5, 7 lunge/
Alternatively, an attractive magnetic piece can be used instead of the magnetic piece that is provided around or attached to the top surface of the /. Further, as shown in FIG. 6, it is also effective to introduce gas or liquid at a predetermined pressure between the spindle 5/ and the sieve 52 to maintain the aligned state.

The current fluctuation of the torque motor 4' during screwing of the thread gauge 3Δ and the screw /A is measured by 31, considering it as the fluctuation of torque, and the standoff value is also measured by δ1 with instruction a137. , it is also easy to display these in a digital format. Furthermore, instead of the I'# tunnel, wire rope, and weight shown in FIG. 1 as the means for raising and lowering the tension gauge, a pneumatic or hydraulic sill 7 as shown in FIG. 3 can be used.

In addition, in the example given below, the force used to detect the position of the female screw/no\ by rotating it in the opposite direction (to the left) in contact with the screw gauge/A. ] by repeatedly rotating the pulley 2 in the direction of the arrow, the screw gauge 3 can be rotated in the opposite direction (to the left) while slightly moving upwards. The starting position of the alignment can be detected.

Note that the above actual blIi example is a vertical inspection method, but this A
Even if 1 is changed to a horizontal type, the control operation and R1 control function 11 ii) will be the same.

In addition, in this invention, a drill pipe is fixed to the machine frame in place of the object to be measured in O1J, an object (coupling) is attached to the spindle in place of the object to be measured in J, and the object (coupling) is screwed into the drill pipe. Since this is also easily convertible, tightening can also be applied to force introduction means.

As described above, the present invention allows the screw gauge to be lowered (forward) toward the rear, (2) reversely rotated lower [(...J'ra)
, (3) Forward rotation down (forward), (reverse rotation up (backward)
, (6) The control operation is performed in the order of stop, and when the screw is screwed into the screw gauge, the tightening accuracy of the screw is determined by measuring and controlling the torque value and standoff value, which is different from the conventional method. It is more accurate than the inspector's intuitive judgment, and has the correct screw placement accuracy of 4711! The results are significant: reliability in terms of quality control has been increased, screw surfaces can be inspected without scratches, and inspection capacity has been dramatically increased.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and FIG. 1 is a side view of part 11'j) of screw fitting inspection device; FIG.
Not shown in the figure: grasping the subject i'fl
The figure is an enlarged view of the connecting part between the spindle and the tension gauge shown in Figure 1, the second figure is a sectional view taken along the arrow line A-A' shown in Figure 1, and the figure 5 is the tension gauge and the test object. FIG. 3 is a -hIS cross-sectional side curved view showing another embodiment of the screw fitting inspection device. /...Test, /A...Thread, 3...Thread gauge, G...Spindle, S...Inner i 7, J, /l, /
3... Magnet piece (alignment means), /4'... Torque motor, 35... Standoff detection rod, 37... Instruction 71, A 1f... Tightening I□] tightening torque #I, S...
standoff. 9, 〒51- Applicant Figure 1 j113 Figure 4 Voluntary amendment (II, Examiner) 1
, ``The Compassion of lf'l'' 1981 Patent Department
No. 1/73'l/No. 2, Name of the invention Method and device for inspecting the fit of screws 3, Relationship with the case of the person making the amendment Patent application Person: Month, Day, Showa (Date of shipment: Month, Day, Showa) 6 , Supplement II: Increase in the number of inventions 7, Supplement 11: Subject application 8, Contents of amendment JP 59-7242 (7) Add "Patent Application". (2) r, 2. After the title of the invention: ``Method and device for inspecting the fit of the screws'', ``Number of the first invention described in the claims...2'' is added. Voluntary amendment by Masaaki (II, January 11, 2013, Commissioner of the Japan Patent Office)
Dear (Patent Office Examiner) 1, °1
Table No. 1 of item '1; Showa SFI 1 Patent Department No. 1/7J G/S 2, Komei's name Fitting inspection method and device 3, 111i IF (relationship with old school fi) Patent Applicant (11i <1”+:+91) Daido Special Steel Flavor Ceremony
-Nori power! Showa 41 month rJ (Shipping date Showa
January 11) 6, Number of inventions increases from hli + mortar 7, Supplement 11 subject 8, Ura 11. Contents (1) The claims of the specification are supplemented as shown in the attached sheet. (2) Delete the line 6-7 of page 4, "Rotate the screw gauge in the opposite direction or rotate it in the opposite direction while moving it up and down." (3) Page 15, line 4 [Complete embossed J with "tighten" (= J ke). (4) Page 4, lines 15-16, "rotate up and down..."
J-Correct by "reverse (left) or forward (right) rotation while slightly moving toward the lower axis." 2. Scope of claim (1) After the advancing thread gauge and the screw engraved on the test object come into contact with each other in an aligned state, - detecting the starting position of the screw engagement between the thread gauge and the screw; a first step, a second step of determining a tightening torque value and a standoff value of 411 when the screw is screwed into the screw with the screw gauge moving forward while rotating IF; when the off value is reached, the screw gauge is reversely rotated and retreated to remove the screw as well;
, a second and a third lower step, and J1 measurement is performed in order. (2) Rotation y of the gripping mechanism for the object disposed in the F part of the machine frame and the screw gauge arranged in an aligned state in the 16th part of the machine frame.
A mechanism for measuring a torque value and a standoff value is attached to the 11 rotation mechanism for tightening when the thread gauge and the screw engraved on the test object are screwed together. Features: Screw fit inspection device. (3) The screw fitting inspection device according to claim 2, wherein a magnet piece is provided around the spindle and inner cylinder of the rotary lift mechanism. (4) The screw fit inspection device according to claim 2, wherein a predetermined pressure of gas or liquid is introduced between the spindle of the rotation A lowering mechanism and the inner cylinder.

Claims (4)

[Claims] (1) After the advancing screw gauge and the screw engraved on the test object come into contact with each other in an aligned state, the n+1 marking gauge is rotated in the opposite direction or reversely while moving by 10F to tighten the screw between the screw gauge and the screw. a first (7) step of detecting a mating start position, and a second step of measuring a torque value and a standoff value for tightening when the thread gauge and the screw are screwed together while forwardly rotating. 11. When the screw cage reaches a predetermined standoff value, the screw gauge is reversely rotated and retreated to separate from the screw force 1.
The first, second and third steps are operated and it'
A method for inspecting the fit of screws, which is characterized by testing 1ull. (2) A gripping mechanism for the subject disposed at the bottom of the i-frame;
g11 The machine frame is equipped with a rotary lifting mechanism for a screw gauge arranged in an aligned manner in the machine frame σ, and the rotary lifting mechanism is equipped with a +ti
Inspection of the fitting of screws L, characterized by a marking gauge, a screw engraved on the test object, and a mechanism for measuring the tightening torque value of 1.1 screws on the screw and 7 values of the stand. Device. (3) The screw fitting inspection device according to claim 2, wherein a magnet piece is provided around the spindle of the rotary elevating mechanism. (4) A special S'l' JJ in which gas or liquid at a predetermined pressure is introduced between the spindle and the interior of the rotating lifting mechanism.
The screw fitting inspection device according to item 12 of the scope of demand.